AIS Operational Features

Attention

To display AIS targets on ENC — enable the AIS layer.

Enable
→ AIS Layer
Menu path
→ → Targets → Settings

No.	Element	Description
1	Show AIS group	AIS target display settings
2	Guard zone group	Guard zone settings
3	Lost targets group	Lost target monitoring settings

No.	Element	Description
1	Show AIS	Enable AIS layer
2	Show ARPA targets	Enable ARPA layer
3	ARPA and AIS association	Enable ARPA and AIS target association
4	Show associated targets as AIS	Display associated targets as AIS targets
5	Always show real AtoN purpose	Always display real AtoN

No.	Element	Description
1	Guard zone	Enable guard zone.
2	Show guard zone	Enable guard zone display. Targets entering the guard zone are assigned the status Dangerous target
3	Guard zone radius	Guard zone radius
4	Lost zone	Enable lost target control zone. Within the zone, alerts will be generated for lost AIS targets, ARPA targets, and synthetic targets
5	Lost zone radius	Lost target control zone radius

No.	Element	Description
1	Lost AtoN alert	Generate alarm on AtoN loss
2	Lost SART alert	Generate alarm on SART loss
3	Lost AtoN/SART distance	AtoN and SART loss tracking distance. Beyond the set radius, ECDIS will not generate an alarm for AtoN and SART loss

AIS display settings, processing criteria, and filtering

Menu path
→ → AIS → Filtration and activation

No.	Element	Description
1	AIS activation group	AIS target activation and filtering settings group
2	AIS Filtration group	AIS target display type settings group
3	ASM group	ASM display settings group

No.	Element	Description
1	Auto activation	Enables auto-activation of AIS targets
2	Show auto activation range	Display auto-activation radius (red color)
3	Auto activation range circle	Radius within which AIS targets are activated
4	Max capacity AIS targets	Maximum number of displayed AIS targets
5	Max capacity AIS synth targets	Maximum number of displayed synthetic AIS targets
6	Max capacity ASM	Maximum number of displayed ASM

No.	Element	Description
1	Filtration	Sets all AIS targets to sleeping status
2	Visibility by range	Area radius within which AIS targets are displayed on the chart
3	Visibility range	AIS target visibility distance on the chart
4	Show sleeping targets	Enables display of sleeping targets within the visibility range with the specified filtering parameters: Class A, Class B, CPA, TCPA. The set filtering parameters will be displayed in the permanent indication area
5	Show activated targets	Enables display of activated targets
6	Class A	Enables/disables display of Class A sleeping targets
7	Class B	Enables/disables display of Class B sleeping targets
8	AIS Base stations	Enables/disables display of AIS base stations
9	Real AtoN	Enables/disables display of Aids to Navigation with AIS
10	Virtual AtoN	Enables/disables display of virtual Aids to Navigation with AIS
11	SART	Enables/disables display of AIS SART distress signals
12	SAR Aircraft	Enables/disables display of aircraft (helicopter) involved in search and rescue operations
13	Synthetic target	Enables/disables synthetic targets transmitted by a base station or as ASM

No.	Element	Description
1	Show ASM	Enable display of AIS application specific messages
2	Tidal window	Tidal data: high water, low water, current tidal phase
3	Water level	Current sea level value
4	Current	Current surface current value
5	Wind	Current wind value, average wind and gust forecast
6	Weather	Current weather data for the specified period
7	Sea State	Sea state (wave conditions)
8	Air Grap	Current air gap height under an overhead crossing or bridge
9	Area Notice	Areas subject to warnings, alerts, and special information
10	Berthing data	Availability of port services at berths
11	Routing	Routes transmitted by addressed message (main, alternate, ice)
12	Signal Station	Current port dispatcher signal, the next signal, and its activation time

Note

ASM are transmitted as both broadcast and addressed messages. The navigator manages the reception of addressed ASM independently. ECDIS only displays received messages.

After enabling the AIS layer display, all AIS targets, synthetic targets, and ASM within the AIS target visibility radius will be displayed on the chart.

Important

ECDIS supports displaying a limited number of targets. To avoid overloading the ECDIS computer, limits on displayed targets on the ENC must be set:

Max capacity AIS targets – no more targets than specified are displayed. AIS target filtering is performed by distance. When a new target appears, the most distant non-dangerous target is removed from display.

Max capacity AIS synth targets – no more synthetic targets than specified are displayed. Synthetic target filtering is performed by distance. When a new synthetic target appears, the most distant non-dangerous synthetic target is removed from display.

Max capacity ASM – no more ASM than specified are displayed. ASM filtering is performed by distance. When a new ASM appears, the most distant ASM is removed from display.

Load management is performed only within the set visibility radius.

No.	Element	Description
1	Own ship	Own ship symbol on the chart
2	Sleeping target	Non-activated AIS target within the visibility zone
3	Guard zone	Circle defining the target control area
4	Dangerous target	Target requiring the navigator’s attention
5	Name of dangerous target	Text label of the dangerous target on the chart
6	Auto-activation zone	Circle upon entering which targets are automatically activated
7	Activated target	Target under tracking with detailed information displayed
8	Tracked target symbol	Visual marker of the target selected for tracking and target data in the multifunction window
9	Name	Name of the tracked target
10	Closest Point of Approach (CPA) to target	Minimum distance at which the target will approach own ship
11	Time to Closest Point of Approach (TCPA) to target	Time to closest point of approach
12	Course Over Ground (COG) of target	Course Over Ground — direction of target movement over the Earth’s surface
13	Speed Over Ground (SOG) of target	Speed Over Ground — speed of target movement relative to the Earth’s surface
14	Heading (HDG) of target	Heading — compass heading, if transmitted
15	Rate of Turn (ROT) of target	Rate of Turn — rate of heading change, if transmitted
16	Targets Table	Opens the targets table
17	Details	Opens the extended target form
18	Bearing (BRG) to target	Bearing — Bearing to the target from own ship
19	Distance (DIST) to target	Distance — Distance to the target from own ship
20	Target Coordinates	Geographic coordinates of the target
21	POS ACC	AIS target position accuracy
22	RAIM	Navigation data integrity monitoring indicator in the AIS target
23	Messages	Opens the incoming messages table. When new messages are received from the target, a new incoming message symbol will be displayed to the right of the button
24	Target MMSI	Maritime Mobile Service Identity — unique vessel identifier
25	Target call sign	Vessel radio call sign
26	Status — Navigation status of target	Current navigation status of the vessel (under sail, at anchor, etc.)

AIS targets are displayed in accordance with the configured filtration and activation settings. The coordinates, vectors, and trajectories of AIS targets are displayed on the ENC based on the data from their last received message, in accordance with ECDIS settings.

Depending on the AIS target type, the content of the target form may differ:

AIS target form transmitted by ARPA

Search and rescue aircraft AIS target form

Target Activation and Deactivation

Forced tracking of a target outside the auto-activation radius is performed manually.

In automatic mode, activation occurs if the target enters the auto-activation radius or becomes dangerous. Upon leaving the auto-activation radius or when the dangerous status is removed, the target is deactivated.

To forcibly activate a target — hover the cursor over the target, right-click (press and hold) to open the context menu, select Activate. The target will be placed under tracking.

To forcibly deactivate targets — hover the cursor over the target, right-click (press and hold) to open the context menu, select Deactivate. The target will be deactivated.

Target Information

Target information is displayed in the AIS window. To obtain target information — left-click (tap) on the target of interest.

The target will be highlighted with a frame. The information on the selected target will be displayed in the AIS window.

CPA/TCPA

Target monitoring by closest point of approach and time to closest point of approach.

Menu path
→ → Targets → CPA/TCPA

No.	Element	Description
1	Don’t calculate CPA/TCPA	Disables CPA/TCPA calculation in ECDIS
2	CPA/TCPA alarm	Enables target monitoring
3	Closest point of approach	Sets the closest point of approach distance
4	Time to closest point of approach	Sets the time to closest point of approach

After enabling CPA/TCPA monitoring, all targets within the visibility zone will be monitored by CPA/TCPA. When the CPA/TCPA value is below the set threshold, targets will be automatically activated, marked as dangerous, and ECDIS will generate an appropriate alarm.

Lost Targets

When Lost target alert is enabled, targets from which no data is received within the specified timeout will be marked as lost. Lost targets are removed from the chart, and a lost target warning is generated.

Warnings are generated only for active targets.

If data stops being received from a dangerous target, the target will be marked as lost but will remain on the chart. ECDIS will generate a lost target warning. When the warning is acknowledged, the target will be removed from the chart.

Own Ship AIS

ECDIS can display data from the own ship AIS.

Menu path
→ → Targets → AIS → Own ship

No.	Element	Description
1	AIS transmits	Data transmitted by the AIS sensor over the air
2	System data	Current data set in ECDIS settings, to be sent to AIS
3	Send data to AIS device — forced transmission	of own ship data to AIS

Data Transmission to AIS Transponder

Vessel data can be transmitted to AIS from ECDIS.

Data modification is performed in Registration data.

Data transmission is performed automatically with a 5-minute interval. If necessary, data can be sent forcibly:

Menu path
→ → Targets → AIS → Own ship → Send data to AIS device

Data is transmitted in VSD and SSD sentences, which include the following information:

• Cargo category (message 5)

• Navigation status (messages 1, 2, 3)

• Draught (maximum actual static, message 5)

• Port of destination (message 5)

• Estimated date and time (UTC) of arrival (message 5)

• Number of persons on board the vessel (message 5)