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Selecting an independent NMEA output-port datum
In all past software versions, the geodetic datum you set for the
output ports was the same as the one for positional display. In
software version 2.10 and later, you can adjust output position
for NMEA 0183 ports 1 and 2 to specific geodetic datums,
independently of the datum you choose for positional display.
To select an NMEA output-port datum:
1. At the CHART screen, press the STAR key four times until
you display the USER CUSTOMIZATION screen, then press
the PORT SETUP OPTIONS key.
2. At the PORT SETUP OPTIONS screen, press either the PORT 1
SETUP menu key or the PORT 2 SETUP menu key. Both the
PORT 1 SETUP and PORT 2 SETUP screens have a new field
called OUTPUT DATUM.
3. Press the CURSOR PAD down to select the OUTPUT DATUM
field, then press the EDIT menu key.
4. Press the CURSOR PAD up or down to select the desired
datum.
5. To apply this chosen datum to your lat/lon coordinates in the
NMEA 0183 output sentences, press the ENTER key (or press
the CLEAR key to leave the option unchanged).
Canadian tide stations
Approximately 350 Canadian tide stations (using NOAA's US
model and data) have been added to the 941's tide database. In
total, 3540 tide stations are now stored in the 941.
Changes to DGPS stations
The DGPS station "Montauk Point" has been moved to "Moriches,
NY." The name of the DGPS station "Port Aux Basques" has been
changed to "Cape Ray" (Canada); its frequency and location is
288.0 kHz, 47 38N 59 14W.
032101
– 7 –
Addendum P/N GM210
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