Raymarine AIS250 User's Guide download pdf (Page 27)

Your AIS system can help with collision avoidance using the

following functions:

• Safe zones.

• Safety messages.

A safe zone is a red ring displayed on radar and/or chart pages

around your boat. Targets that come within this ring are consid

ered dangerous.

An AIS safe zone uses the same criteria as MARPA to deter-

mine a targets status. A target is considered dangerous if it

comes within the CPA or TCPA of your boat. The CPA and

TCPA are calculated using COG/SOG and position from the AIS

target.

When your system recognizes a dangerous AIS target:

• The target symbol changes to red and flashes.

• An alarm pop-up is displayed.

• An alarm sounds.

With your AIS receiver connected and functioning, the system

continually checks for dangerous targets within the safe zone

and sounds an alarm if enabled, when necessary. However, the

dangerous target alarm operates irrespective of the AIS target

display or safe zone ring status.

1. Select AIS Options

2. Press

TARGET TRACKING.

The AIS options soft keys

appear.

3. Press

MARPA & AIS OPTIONS

. The MARPA and AIS

options dialog box appears.

Vector Length

The distance the vessel will travel

in the selected time period, at

current COG & SOG

0.5min, 1 min, 3 min,

6min, 12min, 30 min, 60

min

Target History

Plots a MARPA target’s previous

position at specified intervals. The

four most recent position points are

displayed. If True target vectors are

selected, the four most recent

vessel position points are also

displayed.

OFF, 0.5 min, 1 min, 3

min, 6 min

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 37 38

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Raymarine AIS250 User's Guide Page 27

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