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SECTION SIX: Interfacing the 957 system
957 INSTALLATION MANUAL, Revision C1 Page 43
NMEA 0183 format, the checksum isn’t used. (Note: Since
the checksum isn’t used, the 957 may receive incorrect
NMEA data when connected to an external Raytheon
loran.)
•
Datamarine CDX is required by Datamarine’s
cross-track-error indicators, the latest of which display
distance and bearing to the waypoint.
Displaying NMEA output sentences
When you select 0183 or 0183 RAY as the output format (after
pressing the EDIT menu key) and press ENTER, a screen is
displayed showing all the NMEA 0183 sentences the 957 can
output.
Three-letter abbreviations identify each sentence and are listed
alphabetically. (For the meaning of these sentences, see the
NMEA interface specifications document published by the
NMEA.) The sentences to be output are followed by the word
ON; those that won’t be output have two dashes indicating that
they’re off. Some devices can’t handle all these sentences
correctly, so you can customize the output here by turning
individual sentences on or off. In general, you may want to turn
on only those sentences used by the particular equipment
interfaced to the 957.
Turning NMEA output sentences on and off
To turn on or off the 957’s NMEA 0183 sentences, first follow
the above description to display the 0183 SENTENCE screen,
then follow these steps:
1. Press the CURSOR PAD to highlight the sentence you
want to turn on or off, then press the EDIT menu key.
2. Press the CURSOR PAD to toggle the sentence on or off,
and press ENTER to make your selection (or CLEAR to
leave it unchanged).