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RayTech Navigator User’s Guide
5-28
Figure 5-9. Radar Target Symbol Key
Target Vector and History
The MARPA targets can be displayed with a vector line showing
where they will be at a certain time in the future, (assuming present
course and speed). You can select a relative or true vector and the
vector length.
You can also select to view the targets history, this appears as a series
of dots that are dropped by the target as it makes way. The interval
between them is selectable.
A relative vector indicates the targets motion related to your own ships
motion. The targets relative course and speed are calculated to produce
a vector that is displayed on the target only. This mode is used for
collision avoidance and threat assessment.
A true vector indicates the targets motion over ground. In this mode
true vectors for the target and your own ship are displayed. MARPA
measures the direction in which the target and own ship are actually
moving over the ground. The result is the vessels true course, the rate
of motion is the vessels true speed. Consider this motion as if you
were in a helicopter looking down watching the targets move across
the water. This mode can aid navigation.
Radar Range Scales
MARPA target acquisition is only available at radar range scales of up
to 12nm, although tracking continues at all ranges. If you change to a
lower range scale, targets may be beyond the range of the scanner and
will be lost.