NorthStar Navigation GM1708 961XD - Manual (Page 59)

SECTION THREE - Interfacing
961 INSTALLATION MANUAL Revision A Page 49
light the FORMAT field (for either 0183 or 0183 RAY), then press the 0183
DATA
key to display the sentences.
Figure 25: Port 1 output setup (sentences) screen
About the NMEA
TLL sentence
The 961 also supports the NMEA TLL sentence, sometimes referred to as
the “rattle” sentence. This sentence allows the 961 to communicate its
position to an interfaced radar device, which tracks a user-defined target.
In turn, the interfaced radar device communicates to the 961 the target’s
position in lat/lon coordinates so that you can see the target symbol dis-
played right on the 961’s CHART screen. To have the TLL sentence input
properly, you must set to “output” the port to which you are connecting.
Three-letter abbreviations identify each sentence and are listed alphabet-
ically. The meanings of the NMEA 0183 three-letter identifiers are
described in the table below.
Table 7: NMEA 0183 sentence identifiers
0183 identifier Meaning
APB Autopilot Sentence “B”
BOD Bearing to Destination
BWC Bearing & Distance to Wpt. (Great Circle)
BWC V1.5 Bearing & Distance to Wpt. (Great Circle),
version 1.5
GGA GPS Fix Data
GLC Geographic Position, Loran-C
GLL Latitude/Longitude
GLL V1.5 Latitude/Longitude, version 1.5
GSA GPS DOP and Active Satellites