Reference Manual Part 2

G-Series Reference Manual 162
Time to safe zone
The time to safe zone function calculates how long it will take other
AIS-equipped vessels to reach your safe zone, based on their AIS
data. You can set your system to alert you when such vessels
reach a designated ‘time to safe zone’.
To set the time to safe zone
1. Press the TARGET TRACKING softkey.
2. Press the MARPA and AIS OPTIONS softkey.
3. Select Time to Safe Zone in the MARPA & AIS OPTIONS
menu.
12.10 MARPA and AIS options
Safety messages
When AIS Safety Messages is on (controlled from the AIS Layer
Setup Menu), incoming safety messages from vessels, shore sta-
tions and mobile stations are displayed in a pop-up box. The
message will include latitude and longitude if it is available.
Whenever you receive a safety message, the system gives you
options to:
• Remove the message (ACKNOWLEDGE).
• Place a waypoint to mark the sending vessel’s position.
Parameter Options
Vector Length
The time period specified for drawing length of
vectors.
0.5min, 1 min, 3 min,
6min, 12min, 30 min, 60
min
Target History
Plots a MARPA target’s previous position at speci-
fied 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
Own vessel safe zone
The safe zone is a ring, centred on your boat, within
which a target is considered dangerous if it comes
within a specified distance (CPA).
0.1 nm, 0.2nm, 0.5nm,
1.0 nm, 2.0nm
Time to safe zone
If a target enters your safe zone within this time
period, it is considered dangerous.
3 mins, 6 mins, 12 mins,
24 mins
Safe zone ring
Controls whether the safe zone ring is displayed or
hidden on screen
Visible
Hidden