210 E-Series Networked Display Reference Manual
If you change to a smaller range scale, targets may be beyond the range of your
scanner and will be lost. In such cases, an on-screen warning will indicate that the
target is off-screen.
Closest point of approach
Closest point-of-approach (CPA) graphics show vectors for your vessel and a
selected target. (A vector is a line showing a predicted course.) Vector length varies
with speed (settings can be changed in the MARPA Setup Menu).
To show or hide closest point-of-approach
1. Highlight the object with the cursor.
2. Toggle to the required CPA setting using the CPA GRAPHIC softkey.
How motion modes affect CPA
In true motion mode, the vectors of your vessel and the target are shown
extended to their intersection point. The CPA is shown as a line that is placed on
your boat’s vector at the point of the CPA. The length and direction of the line
indicates the distance and bearing of the target at CPA. The text indicates CPA and
TCPA. The text next to the target symbol indicates its true course and speed.
MARPA targets
D6810_4
D9008_1
Vector
CPA graphic
39
81244_4.book Page 210 Thursday, January 31, 2008 1:53 PM
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