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[NEW] AIS [OpenCPN Manuals] | ais buddy – Uptechitalia

ais buddy: นี่คือโพสต์ที่เกี่ยวข้องกับหัวข้อนี้

Table of Contents


AIS Operating Controls

The Menubar-AIS and Toolbar-AIS provide useful operating controls of key AIS parameters which may need to be adjusted during use.

MenuBar> AIS Dropdown

To turn on the Menubar use Options> User Interface> Show Menubar \

  • Show AIS Targets
    * Hide Suppress anchored/moored targets
    * Attenuate less critical AIS targets
    * Show AIS Target Tracks
    * Show CPA Alert Dialogs
    * Sound CPA Alarms
    * AIS Target List
    These Menubar > AIS Dropdown controls work together for quick access:

    Thesecontrols work together for quick access:

  • Show AIS Targets=Options > Ships > AIS Targets > Display: Show AIS

  • Hide Moored AIS Targets=Options > Ships > AIS Targets > Display: Suppress Anchored/Moored Targets…

  • Attenuate Less Critical AIS Targets.. [Exception, see below]

  • Show AIS Target tracks=Options > Ships > AIS Targets > Display: Show Target Tracks Length (min)

  • Show CPA Alerts=Options > Ships > AIS Targets > CPA/TCPA Alerts: Show CPA/TCPA Alert Dialogs

  • Sound CPA Alarms=Options > Ships > AIS Targets > CPA/TCPA Alerts: Play sound to CPA/TCPA Alerts…

NOTE: Options > Ships > AIS Targets > Display: Check Attenuate Less Critical AIS Targets to enable it. Also when “Attenuate..” is unavailable, the Toolbar AIS Icon click rotation drops the selection for Attenuate all AIS targets.

Toolbar > AIS

Toolbar AIS Icon Message (Clickable Rotation to change settings. Read the pause message.)

  • Attenuate Less Critical AIS Targets (if enabled under Options > Ships > AIS)

  • Hide AIS Targets

  • Show all AIS Targets

  • Attenuate all AIS Targets (dropped in rotation if unchecked under Options > Ships > AIS Targets)

What is an MMSI number? Maritime Mobile Service Identifier (MMSI) is a number identifying a ship in communication. MMSI consists of nine digits. All VHF units using Digital Selective Call (DSC), are programmed with the vessels MMSI. The same applies for AIS and EPIRBs.

What is an IMO Number?International Maritime Organization (IMO) numbers are a unique reference for ships and for registered ship owners and management companies.

They were introduced under the SOLAS Convention to improve maritime safety and security and to reduce maritime fraud. For ships, the IMO number remains linked to the hull for its lifetime, regardless of a change in name, flag, or owner.” From Wikipedia

Instead of just hovering the cursor on an AIS object, double click, and the dialog above pops up. A lot of relevant information is displayed. CPA, Closest Point of Approach, to Ownship is 12.7 miles in 12 min 57s. More information about the target itself, is available on Internet address: MarineTraffic http://www.marinetraffic.com/ais/shipdetails.aspx?mmsi=”MMSI number here”,

in this case: http://www.marinetraffic.com/ais/shipdetails.aspx?mmsi=233150000

Buttons in the Target Query Dialog

Create Waypoint drops a mark at the targets current position.

Record Track/ Stop Recording Pressing the Record Track button brings up a new dialog.

The recently recorded track of the “Poseidon Leader” will appear in the Route & Mark managers track tab on a line starting with “AIS Poseidon Leader…”.

If the Yes button is pressed, the Target Query Dialog button Record Track changes to Stop Recording. All tracks recorded will behave just like any other track.

Right-clicking an AIS target brings up a dialog focused on AIS.

More and more aids to navigation are equipped with an AIS transmitter, and show up as a target in OpenCPN like this

Note the word “Real”, that says that this is an object that exists in reality.

Here we have an AIS transmitter on a floating W Cardinal Mark. This is of course real and the buoy is on position. If the buoy is off position, for some reason, the Aton icon becomes red.

There are also Virtual AtoNs marked with their own icon.

The icon below illustrates that IALA marks also display their top marks. In this case it’s a “special mark”.

Virtual AtoNs are used to quickly make mariners aware of things like new wrecks, uncharted hazards and floating debris. They are normally used for a short duration until replaced by real aids or charted, removed or dispersed. Virtual AtoNs are also used for information. For example, the position of the Italian Maritime Rescue Coordinating Center. Note the word “Virtual” in the dialog.

Note: OpenCPN handles the situation where MMSI is set to 0 (zero). This can occur with an incorrectly configured AtoN. Nevertheless, all available information is shown.

How often is the AIS information updated from each target? The required update rates from an AIS target transmitter is shown below.

Class A Class B
Static Data 6min6min

Dynamic Data < 3kn moored3min

upto 2kn10s3min

> 2kn 30s

< 14kn (turning)10s (3.33s)

< 23kn (turning)6s (2s)

> 23kn2s

Another way to present the AIS information. The AIS target list is available through the right click menu.

Sorting targets

Click on the header in a column to sort according to this criteria. For example, clicking “Range” sorts the targets with the nearest target on top. Click one more time to get the target, furthest away on top. There is an “autosort” checkbox. When checked, auto sort is on. May be unchecked/rechecked any time. The autosort checkbox is automatically unchecked when target count exceeds 1000. However, it may be rechecked directly by the user, even if the target count is exceeded, and will stay checked.

Active Search And Rescue Target (SART) and Digital Selective Calling (DSC) distress targets, will always stay at the top of the list, even when sorting.

AIS targets with Lat > +/-85 deg will show brg “unavailable”. OpenCPN is not suited for Polar Navigation. * Target Info button: Click on a target to highlight it and then click the button to display the information dialog.

  • Center View button: Highlight a target an click this button and the screen will center on the target.

  • Create WPT. Drop a waypoint at the current position of the target.

  • Hide All Tracks If tracking is on in Options→Ships→Ais Targets, all tracks will disappear from the screen. Read more furher down this page.

  • Show All Tracks Will reverse the previous option, and show all available tracks. If Options→Ships→Ais Targets is off, tracking will start for all targets.

  • Toggle Track Reverse the tracking status.

The Trk column in the list indicates current tracking status for each target.

  • AutoSort See “Sorting Targets” above, for an explanation of this box.

  • Limit Range: The list will only show targets with a range less than, or equal to this value.

  • Target Count: Total number of AIS targets.

This file is a simple list with fie columns (MMSI Number, Track Mode, Ignore, MOB, VDM→VDO, Follower, Ship Name). It is saved in your User file (Windows: C:\ProgramData\Opencpn\ ) near the opencpn.ini file. It is used to provide Vessel names that frequent your area because the vessel name is not sent or available all the time.

Static data including vessel name, call sign, dimensions, etc., are sent once every six minutes. The MMSINAME.CSV exists to provide names for vessels sending AIS messages while your system has yet to receive the static data.

MMSI numbers and names are added at the end of the file and not updated. Multiple entries can happen and may be caused by confusing configuration of the AIS transponders. Users experiencing performance issues can delete the MMSINAME.CSV file, when it had become too large. A new csv file will be created on receipt of the next MMSI.

OpenCPN does NOT show Ownship (i.e. AIVDO message) as an AIS target or in the target list. AIVDO is processed only in the main navigation thread. The only true way to monitor the output of a transponder, is with a separate AIS receiver. Earlier releases did show ownship, but this was a bug, simply an illusion. The earlier presence of AIVDO (ownship) information in the data stream, really only indicated that the transponder was turned on and received GPS signals.

NOTE: There is good reason NOT to always filter AIVDO. Some users prefer to use AIVDO, instead of some other GPS receiver’s messages. They may be using an older receiver with low sensitivity, slow capture, etc. The way I see it is this: Whether you know it or not, if you have an AIS transponder, then you have two GPS receivers. Only you (the user) can know which is to be preferred in your own environment.

Select your AIS input port in the Connection Tab. The AIS button in the ToolBar, appears different according to the following conditions.

The AIS toolbar tool cycles with each mouse click as follows: (hover for next control action)

  • AIS show all targets (normal, default)

  • AIS Scale non-critical targets. (Provided it has been enabled under Options > Ships > AIS Tab)

  • AIS Hide all targets

  • and back to AIS Show All targets.

Also please refer to AIS Operating Controls above, under Toolbar > AIS Icon which shows how to change key AIS settings by pausing the mouse on the AIS Icon to view the popup message indicating how the AIS controls will change with the next click on the icon. These controls rotate or cycle with each click.

AIS Alive. The default AIS button. This icon appears as soon as an AIS port is active in the tool-box. It is also the normal state with an AIS receiver working and with no targets of interest.

AIS Alive and Activity, a small green circle will illuminate in the lower right corner of the Ais buton. If there is at least one AIS message every 4 seconds, the light will remain illuminated.

AIS Suppressed. This icon indicates only that target suppression is activated in the AIS tab in the ToolBox. Referring to the picture above there are two sort of suppression:

  • Suppress display of all moored/anchored targets, max speed specified in dialog.

  • Suppress Alerts for moored/anchored targets.

This icon will be over-ridden with the AIS alarm button if an alarm is, or becomes, active according to the AIS tab alarms settings in the toolbox.

AIS Alarm. A target exist that raises the alarm as defined in the AIS tab in the ToolBox. It is the three settings “CPA Calculations”, that rules if and when an alarm is raised.

AIS Disabled. No targets, if available, are shown on the screen. This button toggles with the other buttons. For example, if the AIS alarm button is visible, click the button and it will change to the “AIS Disabled” button, and all targets, alarms etc, disappears from the display. Click again and the original button and AIS display comes back.

Attenuate less critical Targets

This tab controls the behavior of many things in the AIS display. There are no “best” settings. It all depend on where you are, what kind of navigation you are into and what kind of vessel you are on. It is your responsibility to evaluate this.

Rules for when the Closest Point of Approach- CPA (when two vessels are nearest each other) and the Time For Closest Point of Approach (TCPA) is calculated, and when warnings are activated. There are three tick boxes, which can be activated with user set values.

No CPA Calculation if target range is greater than (NMi)

If the vessel is far away it is less interesting to calculate CPA. In a busy waterway this could cut down on clutter and processing speed if a reasonable value is set.

Warn if CPA is less than(NMI)

Similar arguments to No 1. This controls when a warning for minimum CPA distance is given. A warning can be both on the screen and a sound. The CPA is shown on the screen when a warning is active.

..and TCPA is less than (min)

This Box can only be activated if the previous box is active. If the minimum CPA is far in the future, it’s not so interesting. If it’s hours away, both vessels have probably changed speed and course in the meantime. Set TCPA to a reasonable value value depending on circumstances. A lower value if negotiating a busy waterway. A higher value when offshore. Many factors plays a role here. If you need to get off watch crew up on deck for a manuver, take this into account, for example. Do you find that you get to many useless alarms? Consider lowering this value and/or the CPA value. If a target is within the distance set in #1 and without an active warning, theCPA can be shown anyway through right-clicking on the target.

Show Target CPA

Show Target CPA toggles with Hide Target CPA

In Target CPA Details, a few more tricks are available.

Rules for how lost targets should be handled on the display.

Mark Target as lost after (min)

Target is regarded as lost if no transmission are received for the number of minutes set here, the target will change on the display and have a black bar across.

Remove lost targets after (min)

The lost target will be removed from the display after the number of minutes set here.

If and how a vessels course and speed should be displayed and if stationary vessels should be on the screen.

Show target COG predictor arrow, length (min)

An arrow will be shown in front of the vessel representing it’s COG (Course Over Ground). The length of this arrow and the dot at the end of it represents the calculated position in the number of minutes set here. Set easily calculated values. If a vessel approaches you doing 15 kts and the time is set to 6 minutes, the dot will be 1.5 nautical miles ahead of the vessel.

The width of the “Target COG predictor arrow” can be adjusted in the opencpn.ini configuration file. Find the line below and adjust the value.

Warning: Don't edit to the opencpn.ini (opencpn.conf) file when OpenCPN is running.

Target saved to WP

When an AIS Target is saved to a Waypoint it is automatically given a meaningful name (mmsi boat name, mmsi number & time) and showings position at that time. Right click an AIS Target and pick from the menu.

To track or not to track?

This choice below boils down to two basic scenarios.

  • All targets will be tracked, with the option of turning off tracks for selected targets.

  • No targets will be tracked, with the option of starting to track selected targets

The Target List Trk column indicates current tracking status of each target. There is more about tracks in the section “AIS Target List” above.

Show target tracks, length (min)

This is the basic setting that can be refined in the “AIS Target list”. With this box ticked targets are tracked even if they are not displayed. Start out with this option ticked, if you hesitate. Come back and fine tune the settings later on, if necessary.

A track will be shown behind a target. This helps to judge the target vessels intentions.

When “Show target tracks” is ticked, the context sensitive AIS menu changes to include the toggle option “Hide Target Track – Show Target Track”.

When “Show target tracks” is NOT ticked, the context sensitive AIS menu changes to include the toggle option “Show Target Track – Hide Target Track”. A big difference, in this case, is that OpenCPN has no record of the track. The tracking will start from the moment “Show Target Track” is clicked.

Suppress anchored/moored targets

“Suppress anchored/moored targets, speed max (kn)” A target will not be displayed if the speed is less than the value set. There are two exceptions to this rule, “Aids to Navigation (AtoN)” and “Vessels Not Under Command”. The rule is aimed at catching anchored or moored vessels. The “Navigational Status” is set by the ships and may not be correct. Be aware that the COG arrow will not be shown for any target with a COG less than this value, hence it’s important to enter a very low value.

Attenuation of less critical targets

“Allow attenuation of less critical targets if more than …targets [number]” If checked AND selected under “Menubar-AIS” or “Toolbar-AIS” then at least [number] of targets will be displayed normally. If unchecked then all AIS targets are displayed normally and this option is greyed out and unavailable.

Note smaller attenuated green ship on lower left.

“Attenuation of Less Critical Targets” will declutter the display without removing AIS targets from the display by reducing the size of less critical targets. Less critical targets are determined with a weighted rules filter. The important targets remain unchanged, including display of the ships name. Less critical targets are reduced in size and do not display ship name, to reduce clutter on the chart.

Details for Attenuation of Less Critical Targets

The “importance” of a target depends on:

  • Speed of the target. Faster targets are more important (max speed acknowledged is hard coded at 12 knots).

  • CPA. The closer a target will come the more important it is.

  • TCPA. If the time to ‘collision’ is small the target is more important.

  • Distance to the target. Far away is less important.

  • Size of target. Larger targets are more important.

  • Class B targets don’t transmit ships size and is set to 0(zero).

For each parameter above a factor is calculated. The highest value of this factor depends on the value in the config file. All these values are then added, which gives each target a ‘weight’.

From all AIS targets the top [number, say 10] targets which are most important, are displayed at full scale. Only [number, say 10] important targets are displayed, depending of the value in Options > Ships > AIS > Display: “Allow attenuation of less critical targets if more than …targets [number]“. The weighted importance is frequently calculated and as long as a target remains in the top [number, say 10], it will be displayed normally.

The less critical targets are still displayed, but at reduced size. The size of the less critical targets can be adjusted with the


setting in the config file, where 50 stands for 50%. Scaled down targets don’t have names, no nav status symbols, and no heading line.

Show Area Notices(from AIS binary messages).

More about Area Messages here.

Show AIS targets real size

Zooming in on a target will eventually show a rectangle using the real size , if available. The picture below also shows how differences in course and heading are treated.

Show names with AIS targets at scale greater than 1:

[select value] With this box activated…..this is what you get!

Note that this setting also controls if a numerical value will be displayed alongside a tidal current arrow.

Treat WPL sentences as APRS position reports

APRS (Automatic Packet Reporting System) is utilized by HAM radio operators around the world.The NMEA WPL sentence is shorthand for for “waypoint location”. If the box is checked,a WPL sentence will be assumed to be an AIS-like APRS target. Enable it on the AIS tab in the Toolbox if you have it disabled. WPL Sentences have the same functionality as AIS or radar targets (track recording, creating a permanent waypoint on current position etc.)

Dropdown to Create a Mark or APRS Postition Report

Tick the boxes for the kind of information shown when hovering with the cursor over a target. This is what you get with all the settings ticked.

CPA/TCPA Alerts and DSC/SART Emergencies

When an alert is triggered, a jagged circle in red is drawn around the target that set off the alarm. Additional events can be set here, drawing more attention to the alarm. For practical navigation, make sure your alarm sound is set.

Show CPA/TCPA Alert Dialog

Shows an alert dialog on the screen with target information when an alarm is triggered. This setting only applies to AIS CPA/TCPA alerts. A DSC/SART emergency will always generate a dialog.

Play Sound on CPA/TCPA Alert Dialog

and DSC/SART emergencies. Sounds an alarm when an alarm is triggered.

Supress alerts for anchored/moored targets

Don’t show alarms for anchored and moored targets.

Select Alert Sound

Select an alarm that suits you, instead of the installed default sound. This alarm will also be used if an anchor watch is set. Due to copyright issues, only a few sound files are included. The default location for these files are ”/usr/share/opencpn/sounds/” on Linux and typically C:\Program Files\OpenCPN\sounds on Windows XP. Users can add their own generic “.wav” sound files. These files can be in any suitable place in the file-system.

Test Alert Sound

Test the selected sound and make sure this important feature is working.

Enable Target Alert Acknowledge timeout

Once a target alert is acknowledged, wait the set number of minutes before the alert comes up again (if still applicable).

Read all about this tab here MMSI Properties

An alert is set off if your boat is approaching the CPA, the blue dot on the extension of the course line, and the previously discussed set of conditions are met. Once the distance to the CPA increases, this happens when the involved vessels has passed each other, the alarm stops, even if the other conditions still apply.

One user noticed an alert every few seconds, yet the target was still green. The explanation is: Variation between alert status and ship icon color is due to rapid changes in target course/speed. The target color can change from red to green while the alert dialog is showing. This may happen so fast that the red icon is not actually seen. OpenCPN does not automatically cancel the alert dialog in this case, in order to not mask information.

Types of Transponders recognized by OpenCPN

  • Class A

  • Class B

  • APRS Automatic Packet Reporting System Targets

  • ARPA Automatic Radar Plotting Aid Tagets

  • ATON Aid to Navigation, both “Virtual” and “Real”.

  • BASE Base Station

  • DSC Digital Selective Calling Targets

  • GPSG_BUDDY GpsGate Buddy Targets

  • SAR Aircraft Aircraft participating in Search and Rescue.

  • SART Search and Rescue Transponder Targets

OpenCPN Remembers the names of seen and fully identified target. The names are cached internally and help identify targets quicker on next start. Targets not yet fully identified, where the name comes from the cache, are displayed in lime green. See example below. The AIS name caching can be turned off in the opencpn.ini/opencpn.config file by adding a line like this.


The name of the file where the list of previous MMSI and ship names are stored is “mmsitoname.csv” in case you would like to clear it. This file is in the same folder as your configuration file (Click the ? icon in the toolbar to see the location, it is platform dependent).

For MOB SART information see SART

Automatic Identification System

For a general introduction to AIS, Automatic Identification System is a good place to start, also AIVDM/AIVDO protocol decoding by Eric S. Raymond

AIS transceivers automatically broadcast information, such as their position, speed, and navigational status, at regular intervals via a VHF transmitter built into the transceiver. The information originates from the ship’s navigational sensors or is programmed. when installing the equipment (call sign, ship name, etc).

The signals are received by AIS transceivers fitted on other ships or on land based systems. The received information can be displayed on a screen or chart plotter, showing the other vessels’ positions. Data is transmitted via a tracking system which makes use of a Self-Organized Time Division Multiple Access (SOTDMA).

Class A Vessel-mounted AIS transceiver (transmit and receive) which operates using SOTDMA (maintains a timeslot memory map, preannounced timeslot reservations, prioritized transmissions). Class A is self organizing, as each transmission claims a timeslot for the next transmission. If there is no free timeslot available the AIS claims the timeslot of another vessel that has the largest distance. There are 4500 timeslots per minute available, so it must be really crowded to run out of timeslots. Class A transmits at 12.5 watts, with a default transmit rate every few seconds. Class A receives all types of AIS messages.

Class B Vessel-mounted AIS transceiver (transmit and receive) which operates using either carrier-sense time-division multiple-access (CSTDMA) or SOTDMA; For Lighter commercial and leisure markets. CSTDMA transceivers listen to the slot map immediately prior to transmitting and seek a slot where the ‘noise’ in the slot is the same or similar to background noise, where the slot is not being used by another AIS device. Class B transmits at 2 watts, with a default transmit rate is normally every 30 seconds, but this can be varied by speed or base stations, requires integrated GPS. Class B receives all types of AIS messages. Class B works differently; it is not self organizing at all. Class B is listening. As soon as this AIS device recognizes a time slot without a transmission it will transmit. In theory it is possible that all Class B timeslots are occupied and that a free timeslot is not availabble, or that multiple Class B’s jump try to jump into the same slot. In very crowded areas, it could be wise to lower your AIS antenna. This will stop you from receiving distant transmitters and your own AIS will ‘think’ it is seeing a free slot where a weak signal is available. This will make your (stronger) signal available to nearby receivers.

Base Station Shore-based AIS transceiver (transmit and receive) which operates using SOTDMA. Base stations have a complex set of features and functions which in the AIS standard are able to control the AIS system and all devices operating therein. Ability to interrogate individual transceivers for status reports and or transmit frequency changes.

ATON Aids to Navigation Shore or buoy-based transceiver (transmit and receive) which operates using fixed-access time-division multiple-access (FATDMA). Designed to collect and transmit data related to sea and weather conditions as well as relay AIS messages to extend network coverage.

SART Search and rescue transceiver Specialist AIS device created as an emergency distress beacon which operates using pre-announce time-division multiple-access (PATDMA), or a “modified SOTDMA”. The device randomly selects a slot to transmit and will transmit a burst of eight messages per minute to maximize the probability of success. A SART transmits a special message format recognised by other AIS devices up to a maximum of five miles. A SART is designed for periodic use and only in emergencies, due to stress put on the slot map.

AIS uses the globally allocated Marine Band channels 87 & 88. AIS uses the high side of the duplex from two VHF radio “channels” (87B) and (88B)

  • Channel A 161.975 MHz (87B)

  • Channel B 162.025 MHz (88B)

The simplex channels 87A and 88A use a lower frequency so they are not affected by this allocation and can still be used as designated for the maritime mobile frequency plan.

Most AIS transmissions are composed of bursts of several messages. In these cases, between messages, the AIS transmitter must change channel.

The “Type of Ship” is indicated with a 2 digit number which is translated according to US Coast Guard AIS Encoding Guide. These must be set in your AIS Transponder or Transmitter. OpenCPN does not have that function. Here is a brief listing for example:

  • 20 WIG (Wing in ground)

  • 30 Fishing

  • 31 Tow (ahead or alongside)

  • 32 Tow (astern or long)

  • 33 Dredging

  • 34 Diving (persons in the water)

  • 35 Military Operations

  • 36 Sailing

  • 37 Pleasure Craft

  • 40 HSC (High Speed Craft) or Passenger Ferry

  • 50 Pilot

  • 51 SAR Vessels

  • 52 Tug

  • 54 Anti Polution Equipment

  • 55 Law Enforcement

  • 58 Medical

  • 60 Passenger (other than HSC)

  • 70 Cargo (Freight or Integrated tug barge ITB)

  • 79 Cargo

  • 89 Tanker

Navigation Status must always be up-to-date. Class A Devices have 4 bits for this value. Class B Devices don’t. See NavCen USCG Class A

  • 0 = under way using engine,

  • 1 = at anchor,

  • 2 = not under command,

  • 3 = restricted maneuverability,

  • 4 = constrained by her draught,

  • 5 = moored,

  • 6 = aground,

  • 7 = engaged in fishing,

  • 8 = under way sailing,

  • 9 = reserved for future amendment.. for ships carrying DG, HS, or MP, or IMO hazard or pollutant category C, high speed craft (HSC),

  • 10 = reserved for future amendment.. for ships carrying dangerous goods (DG), harmful substances (HS) marine pollutants (MP), or IMO hazard ..

  • 11 = power-driven vessel towing astern (regional use);

  • 12 = power-driven vessel pushing ahead or towing alongside (regional use);

  • 13 = reserved for future use,

  • 14 = AIS-SART (active), MOB-AIS, EPIRB-AIS

  • 15 = undefined = default (also used by AIS-SART, MOB-AIS and EPIRB-AIS under test)

  • at Anchor set under *Destination*

  • when Underway set under *Destination*

Remember to change update Navigation Status when at anchor or moored, which reduces AIS reporting rates. The “Navigation Status” is indicated with a 2 digit number which is translated according to US Coast Guard AIS Encoding Guide. These must be set in your AIS Transponder or Transmitter. OpenCPN does not have that function.

Anchored, Moored or On Station setting. Class A devices. Class B devices don’t have these bits.

*Destination* is a 5-character UN location codes (UN/LOCODE) for (per IMO SN/Circ.244) or 4-character U.S. Geographic Unique ID (US/GUID) codes7 according to US Coast Guard AIS Encoding Guide.

Using the Origination>Destination using US/GUID only

  • US^0Y0P><0Q6L …a scheduled route, e.g. Staten Island Ferry

  • US^OX6M>OWYY>OX6M …a roundtrip between Cairo, IL and New Orleans, LA

  • US^0NVR« …anchored, moored, or on station (e.g. MODU, FPSO)

This setting must be set in your AIS Transponder or Transmitter. OpenCPN does not have that function.

AIS Target Quick Graphic References

Note that AIS targets reporting position unavailable will be rendered in grey colour.


An active AIS SART and is a distress call equal to a “Mayday”transmission. More about AIS SART…The V-shape stern indicates a Class B target. Tugboats and pilot boats very often carry Class B transponders. These are often designed specifically for small commercial boats, fishing boats and pleasure crafts.

Icon displayed when testing an AIS-SART device.Targets is complying with the Euro AIS Inland specification.

Aircraft participating in Search and Rescue.This vessel has the “Inland Blue Flag” set, it’s a part of the European, Inland AIS standard. The “Blue Flag” signal, commonly seen on inland waters, indicates that the vessel requests a “stbd-stbd” passage or crossing. This Blue Signal is manually switched on/off, by the target.

Potential Danger.Aton, Aid to Navigation, for example a Lighthouse or a Buoy with an AIS transmitter.

No Danger. Not Identified (Voyage data not received)Aton, Aid to Navigation, that is off it’s suposed position. For example a buoy equiped with AIS that has come adrift.

No Danger. Not Identified (Name from cached data)Virtual Aton, Virtual Aid to Navigation, not a real marker. Can be useful for a range of situations. A new wreck, is one example. Further explanations.
No Danger. IdentifiedVirtual Aton, off position. Actually seen in the wild, but may be a user config error. (Old style display.)

Lost TargetAIS Base Station

Ship which has lost fix – position unavailable. Displayed at the last known position. The following tagets only displays if DSC messages, GpsGate mesages, Radar or APRS messages are mixed in to the incomming AIS stream, by using, for example a multiplexer. More on the following pages.

Vessel not under command.DSC Station. Only the DSC message received. The position contains only degrees and minutes of Latitude and Longitude.

Vessel restricted in ability to manoeuvre.DSC Station. DSC and DSE messages received. The DSE message contains the missing decimals of minutes of Latitude and Longitude. The result is a much more accurate position.

Vessel constrained by draft.DSC Station transmitting a distress signal. Treat this as a “Mayday” call.

Vessel aground.GpsGate Buddy target.

Vessel engaged in fishing.ARPA Target

High Speed- and Wing In Ground- crafts. This includes Hydrofoils, Hovercrafts and low flying crafts utilising the ground effect.APRS Target

Anchored or moored. Displayed when the transmitted “Navigation status” is “at anchor” or “Moored”. There is no guarantee that this status is correct, as it is set manually on the transmitting ship……illustrated by this ship. Note the black line on the yellow circle. This indicates that the vessel is turning to port (left), also illustrated by the lag in the display update. ROT – Rate Of Turn is available in the “Ais Target Query” dialog, through the right click menu.

[Update] DSC or Buddy via AIS. [OpenCPN Manuals] | ais buddy – Uptechitalia

If DSC or GPSGate Buddy-messages are available in an incoming NMEA 0183 data stream, OpenCPN will show them with their own icons, and they will show in the “AIS Target list”. They are not a part of AIS, but are displayed the same way, for convenience.

DSC is used on all new VHF set (or should be!). More on Wikipedia. To use this feature, check that your VHF set outputs NMEA 0183, in a way that can be connected to OpenCPN.

GPSGate is a commercial GPS tracking and sharing service. GPSGate Buddy Tracking is part of that service**.

Make sure that Options–> AIS Targets –>“Play Sound on CPA/TCPA Alerts” box is ticked, otherwise the alarm sound (see below) will not be heard.

If OpenCPN receives a DSC Distress call, an alarm will be triggered, both visually and by sound.

A VHF/DSC distress call is treated in the same way as an AIS/SART call. Both should be treated as MAYDAY calls.

Two different types of alerts.
DSC Distress alert, coming from a specific vessel, presumably by crew activating a switch on the transponder. These are occasionally seen as false alerts, for testing. For the second type look under AIS SART section. SART, which is a SearchAndRescueTransponder. The MMSI starts with 97….. and will have Class: SART. This might be from a
PLB (and PLB-AIS) on man overboard, for instance. PLB AIS devices are under the AIS SART type.

Quick Reference

DSC Station. Only the DSC message received. The position contains only degrees and minutes of Latitude and Longitude.

DSC Station. DSC and DSE messages received. The DSE message contains the missing decimals of minutes of Latitude and Longitude. The result is a much more accurate position.

DSC Station transmitting a distress signal. This is a “Mayday”.

GpsGate Buddy target.

A normal DSC target, is someone using a dsc-capable VHF

Distress message via DSC, Digital selective Calling, from an unidentified AIS target.

A green Buddy target on an island.

The AIS Target List View

Seven Green DSC Position Report Instances, Position displayed in yellow hover box

27 Tỷ Cho 15% Cổ Phần – Atadi | Shark Tank Việt Nam

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Shark Tank Việt Nam là chương trình truyền hình thực tế dành cho các doanh nhân khởi nghiệp thuyết trình trước các nhà đầu tư (SHARK) để thuyết phục SHARK đầu tư vào dự án kinh doanh của mình. Shark Tank đã thành công tại nhiều nước trên thế giới, hiện đã phát sóng: mùa thứ 13 tại Anh; mùa thứ 11 tại Canada \u0026 mùa thứ 7 tại Mỹ.
Tại Việt Nam, Shark Tank được công ty TV HUB độc quyền sản xuất mùa đầu tiên. Shark Tank Việt Nam với những cuộc đua kịch tính, những khát khao thành công bay xa và cảm xúc dâng trào. Chương trình dự kiến sẽ lên sóng trong thời gian ngắn sắp tới, với ban giám khảo là các “cá mập” rót vốn, đều là những doanh nhân lớn và có tiếng tăm trên thương trường.

Theo dõi \”Shark Tank\” trên Facebook: https://www.facebook.com/SharkTankVietnam
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นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูเพิ่มเติม

27 Tỷ Cho 15% Cổ Phần - Atadi | Shark Tank Việt Nam

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Misthy, AS Mobile khoe ảnh người yêu. Nghi vấn AS mua chuộc ban tổ chức?! READY FOR MISTHY

Có ai tò mò về ng iu của as là ai không :))
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Misthy, AS Mobile khoe ảnh người yêu. Nghi vấn AS mua chuộc ban tổ chức?! READY FOR MISTHY

Learn Colors with Pinkfong Baby Shark Bath Paint \u0026 Squirt Toy Surprises

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พออยู่ด้วยกันก็วุ่นวาย! | Baker Boys รักของผม…ขนมของคุณ

เมื่อ \”เวียร์\” เชฟหนุ่มทำขนมหวานเจ้าเสน่ห์ ที่หล่อจนทําให้ลูกค้ายันเจ้าของร้านเป็นอันตบตีแย่งชิงเขาอยู่เสมอ ต้องตกงานเพราะเสน่ห์ของตัวเองอีกครั้ง ได้มาสมัครงานที่ร้าน Sweet Day ร้านขนมหวานเปิดใหม่สุดหรูของ \”ปุณ\” หนุ่มหล่อสุดกวน ทายาทเศรษฐีระดับท็อป ที่ตัวเองมีความหลังฝังใจจนกินขนมหวานไม่ได้ แต่ดันมาเปิดร้านขนมหวานแค่เพราะอยากใกล้ชิดสาว ๆ ที่มาใช้บริการเท่านั้น
เมื่อปุณเห็นโปรไฟล์ของเวียร์ก็รับเข้าทํางานทันที แต่เวียร์กลับมีปัญหาใหญ่ เพราะเขาดันเป็นโรคกลัวผู้หญิง! ทําให้ปุณจําใจต้องรับ \”กระทิง\” อดีตนักมวยดาวรุ่งที่แขวนนวมเพราะโรคประจําตัวเข้ามาช่วยทำงาน แม้ปุณจะไม่ถูกใจกระทิงสักเท่าไหร่เพราะชอบกวนอยู่เสมอ แต่ก็ต้องยอม เพราะกระทิงมีต่อมรับรสขนมหวานขั้นเทพตามแบบที่เวียร์ต้องการ !
ร้าน Sweet Day เริ่มมีลูกค้าเข้ามามากขึ้น แต่ทว่า กลับมีข่าวเด็กถูกลักพาตัว ซึ่งหลักฐานชิ้นเดียวที่คนร้ายทิ้งไว้ก็คือ ห่อขนมจากร้าน Sweet Day ! ทําให้ \”โมเน่\” นักข่าวออนไลน์อันโด่งดัง แอบมาตามสืบข่าวที่ร้าน ซึ่งเธอมั่นใจว่าคนร้ายจะต้องอยู่ที่ร้านนี้อย่างแน่นอน !
โมเน่ได้พบผู้ต้องสงสัย เป็นชายสวมแว่นดําที่คอยด้อม ๆ มอง ๆ อยู่หน้าร้าน แต่ชายคนนั้นกลับเป็น \”พูห์\” บอดี้การ์ดหน้าโหดแต่นิสัยขี้อายของปุณ ที่มาคอยสังเกตการณ์และดูแลนายน้อยของเขา ทําให้สุดท้ายปุณก็ต้องรับพูห์เข้ามาเป็นเด็กเสิร์ฟในร้าน เพื่อไม่ให้มีใครเข้าใจผิดอีก
ชีวิตสุดวุ่นวายในการเปิดร้านขนมหวานพร้อมกับการตามสืบหาคนร้ายจึงเริ่มต้นขึ้น พวกเขาต้องประสบปัญหามากมาย ทั้งเรื่องงาน หรือแม้แต่เรื่องหัวใจสุดมะรุมมะตุ้ม จนไม่รู้ว่าสุดท้ายแล้วความรักวุ่น ๆ เหล่านี้จะลงเอยอย่างไร ?
ลี ฐานัฐพ์ โลห์คุณสมบัติ รับบท ปุณ
สิงโต ปราชญา เรืองโรจน์ รับบท เวียร์
ปลื้ม ปุริม รัตนเรืองวัฒนา รับบท กระทิง
เฟย ภัทร เอกแสงกุล รับบท พูห์
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อั๋น โอลิเวอร์ พูพาร์ต รับบท มานพ
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ติดตาม Baker Boys รักของผม…ขนมของคุณ
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พออยู่ด้วยกันก็วุ่นวาย! | Baker Boys รักของผม...ขนมของคุณ

นอกจากการดูบทความนี้แล้ว คุณยังสามารถดูข้อมูลที่เป็นประโยชน์อื่นๆ อีกมากมายที่เราให้ไว้ที่นี่: ดูบทความเพิ่มเติมในหมวดหมู่Game

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