5.3.8 Conditions For Deciding Ais Target To Be Lost - JRC JMA-5312-6 Instruction Manual

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5.3.8 Conditions for Deciding AIS Target to be Lost

About a lost target

When the data of an AIS target cannot be received for a specified time, the target is decided to be lost and

the target data is deleted. As shown in the table below, the time until target data is deleted varies

depending on the class of receive data and the target status.

Deciding AIS Target to be Lost

Vessel below 3 knots (Class A) or 2 knots (Class B) and it is

now at anchor or on the berth

Vessel of 3 knots or more and it is now at anchor or on the berth

Vessel of 0 to 14 knots (Class B: 0 to 14 knots)

Vessel of 14 to 23 knots

Vessel of 23 knots or more

SAR (Search and Rescue)

ATON (Aid to Navigation)

Base Station

Reference: When a dangerous target ship is lost, a lost alarm is issued and the symbol changes to a lost

symbol. The lost symbol will display continuously on the last-received position.

If the [ALARM ACK] key is pressed, the symbol is cleared.

Target status

5.3 AIS Operation

Time until data deletion