NorthStar Navigation EXPLORER 657 operation manual Viewing AIS Vessels

15-1 Viewing AIS Vessels

C

AB

D

AAIS Vessel

BDangerous Vessel C Projected Course D Data Box

When the cursor is placed over an AIS vessel for at least two seconds, a data box appears at the bottom of the window with information about the AIS vessel.

For complete AIS information on the AIS vessel place the cursor over an AIS vessel for at least two

seconds and press .

Press either or to clear the information.

15-2 Dangerous Vessels

The 657 calculates the time of closest point of approach (TCPA) and closest point of approach (CPA) for each AIS vessel.

This is used to determine potential dangerous vessels. If the TCPA and the CPA is below the trigger values then it will be considered dangerous. (See section 17-9 for setting the dangerous vessel alarm)

A dangerous vessel is indicated on the chart by a red circle around the icon.

TCPA 15 min

CPA 0.5 nm

Northstar Explorer 657 Installation and Operation Manual 55