CP40/50 Position menus Chapter 4
36
Speed indicates Speed over ground.
Course, magnetic or true.
Depth or Compass from external sensor.
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 DGPS receiver built-in or connected:
dGPS= differential data received.
DGPS= corrected differential data received.
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. And DGPS indicates
that the position is corrected by the differential data. The accuracy will
typically be 3-5 meters.
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.
Refer to Position setup display on next page.
F When using C-MAP electronic charts, the datum will be aligned
automatically.
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