Conditions For Deciding Ais Target To Be Lost - JRC JMR-5406-X Instruction Manual

Marine radar equipment

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6.6.7 Conditions for deciding AIS target to be lost

About an AIS target lost

When the data of a 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 received data and the target status.

Since the lost time and that of the AIS indicator are different, this equipment may display lost

information earlier than the AIS display depending on the target status (speed, navigation

status, etc.).

The target of lost target is continuously displayed until Lost Warning is approved.

Since negligence of approval operation may hinder display of a new AIS target, perform

approval operation as soon as possible.

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

symbol. The system calculates the current position from the last-received data and continues

displaying the symbol for eternity.

When the [AIS] button in the target ship information window is turned off, the symbol is

Target status

Vessel below 3 kn (Class A) or 2 kn (Class B) and

it is now at anchor or on the berth

Vessel of more than 3 kn and it is now at anchor or

on the berth

Vessel of 0 to 14 kn (Class B: 2 to 14 knots)

Vessel of 0 to 14 kn and it is now changing the

Vessel of 14 to 23 knots

Vessel of 14 to 23 kn and it is now changing the

Vessel of more than 23 kn

Vessel of more than 23 kn and it is now changing

AtoN (Aids to navigation)

AIS SAR aircraft

AIS coastal base station

Section 6 Target Tracking and AIS

Conditions for Deciding Target to be Lost

Time until data is lost

Non-SOLAS ship

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