CP42/50/52 Position menus Chapter 4
36
Speed indicates Speed over ground.
Course, magnetic or true.
Depth or Compass from external sensor, or actual antenna altitude.
UTC or local time and date
Time and date in UTC – Universal Time Coordinates – is equal to
standard time in London (GMT). UTC is not affected by the local
summertime adjustments.
Status indicator for reception of satellites:
a(A)= good, b(B)= acceptable, c(C)= fair, or *= no update - see also
“Status indicator and accuracy” below.
With built-in or connected DGPS receiver:
dGPS= differential data received.
DGPS= differential data received and used for corrections.
SDGPS= satellite differential data received and used for corrections.
Status indicator and accuracy
Small letters (a,b,c,) indicate that SA is active, and the position
accuracy is expected to be better than 100 meters in 95% of the time.
Capital letters indicate that SA is OFF, and the position accuracy is
then expected to be 15 meters or better in 95% of the time.
dGPS indicates that differential data is received, either via built-in
differential receiver or from external receiver.
DGPS or SDGPS indicates that the position is corrected by the
differential data. The accuracy will typically be 1-3 meters for DGPS
and 2-6 meters for SDGPS.
In order to utilize the high accuracy of the GPS system, it is necessary
to align the lat/long calculations to the paper charts you are using.
RefertoPositionsetupdisplayonnextpage.
) When using C-MAP electronic charts, the datum will be aligned
automatically.
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