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ARPA Target functions · 357
ARPA Target functions
Display of ARPA radar targets
Targets which are tracked by ARPA radar, can also be displayed on ECDIS screen. Select ARPA targets Std or
Other position on Tracking sheet of Chart Display dialog box. There are two kind of targets displayed on electronic
chart area:
· normal targets
· Reference targets
NOTE, AIS and ARPA targets viewing limitations
· AIS and ARPA targets are displayed on top of chart 1:1 000 001 for S57 charts.
· AIS and ARPA targets are displayed on top of chart 1:1 900 001 for ARCS charts. This allow display of AIS
and ARPA targets on top of the largest scale Ocean charts (original scale 1 : 3 500 000) when they are zoomed
to overscale
Targets from the radar can also be displayed on the Electronic chart area. NOTE that reference target has letter "R"
in its label.
Display of dangerous ARPA radar targets
A dangerous ARPA radar target is displayed as a blinking target symbols between colours green and red. The
ECDIS has its own definition for dangerous target limits. Thus ARPA radar may show a target as dangerous while