NorthStar Navigation GM1708 961XD - Manual (Page 58)

SECTION THREE - Interfacing
Page 48 961 INSTALLATION MANUAL Revision A
Setting the
output format
The unit will output navigation data in any of several standard formats as
required by the receiving, or “listener,” device. Upon pressing the EDIT
menu key at this option, you’ll find the following choices available:
NMEA 0180, NMEA 0183, (DATAMARINE) CDX, 0183-R, and OFF.
• NMEA 0180 is an infrequently-used format, developed in the late
1970’s and required by certain older autopilots.
• NMEA 0183 V2.1 is a general-use interface output format is used by
most autopilots, radars, plotters and other equipment. The NMEA
0183 Version 1.5 sentences (BWC, GLL, and RNN) enable the 961 to
be backward-compatible with marine equipment previously
designed for this earlier version of 0183. For details on using the
0183 format, see ”About NMEA 0183 and RAY 0183” starting on
page 48.
• 0183 RAY is used when transmitting/receiving position information
to/from Raytheon equipment. It uses Raytheon’s non-standard
NMEA 0183 checksum, where, on output, the checksum is not
included, and on input to the 961, the checksum is ignored. (It
should be noted that, with the checksum ignored on input, there is
a possibility of the unit receiving contaminated NMEA data when it
is connected to an external Raytheon loran.) Format is supported
on PORT 1, PORT 2, and PORT 3.
• DATAMARINE CDX is required by Datamarine’s cross-track error
indicators, the latest of which display distance and bearing to the
waypoint.
• The Off setting helps to isolate noise problems potentially caused
by I/O.
About NMEA
0183 and RAY
0183
Displaying NMEA output sentences
When you select either NMEA 0183 or NMEA 0183 RAY as the output for-
mat, you can display all the available NMEA 0183 sentences that the 961
can output. From the PORT 1, PORT 2, or PORT 3 output screens, high-
NOTE:
If you’re viewing and editing information on the PORT OUTPUT
SETUP screen, and you press one of the five function keys to
view other data, the 961 immediately cancels your
edit-in-progress so that you can view the data requested by your
function keypress. To resume editing at the PORT OUTPUT
screen, you must return to that screen and re-enter the data that
you lost when you pressed the function key. To purposely cancel
an edit-in-progress, however, you’d normally press the CANCEL
key.