Simrad CE34 ChartSounder Manual page 70

Chapter 5-8 CE34/44/54 Pilot menu & navigation examples
0-9
Key in new values, or...
Toggle between available values
+/-
Confirm editing and return to the Position display
ENT
Datum - is preset to WGS 1984 (World Geodetic System 1984), but
can be changed to any of the 118 datums listed in Appendix B e.g.
to match old paper charts or trackplotter data from RS2500/RS4000
(datum #002 European 1950).
The position in the position display and NMEA output (GLL+GL2)
will refer to the selected datum. To select a new datum: place the
cursor next to "Datum" and key in a new number or go two spaces to
the right (000) and leaf through the datum list with +/-.
The datum in the chart display is fixed i.e. WGS84.
Log - reset log or insert alternative start figure by altering the value
in the "Log 1" and/or "Log 2" line. Press [CLR] to reset the figure,
and press the numeric keys 0-9 to alter the figure.
Additional data - can be set to COMPASS, DEPTH or ANT.
HEIGHT.
COMPASS will show heading from connected sensor.
DEPTH will be shown from built-in echosounder.
ANT. HEIGHT will indicate the actual antenna altitude (height
above sea level).