Simrad CE34 ChartSounder, Manual

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CE34/44/54 Pilot menu & navigation examples Chapter 5-7
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 dif-
ferential data. The accuracy will typically be 2-5 meters for DGPS
and 3-7 meters for SDGPS.
In order to utilize the high accuracy of the GPS system, it is neces-
sary to align the lat/long calculations to the paper charts you are
using. Refer to Position display setup below.
When using C-MAP electronic charts, the datum will be aligned
automatically.
Position display setup
The general Position setup e.g. Display position as: LAT/LON,
Decca or Loran C, etc. is placed in the SETUP menu (section 8.3).
ADJ
From position display, press [ADJ] to load Position display setup:
Pos display setup:
Datum: 000: World Geodetic System 1984
Log 1: 00000.0nm
Log 2: 00000.0nm
Additional data: COMPASS
Go to the function you wish to change
CLR
Reset log