APPENDIX E
Connecting the NMEA 0183 Heading Output
Location of terminal strip J5
The SP-70 autopilot has a data bus that sends out NMEA 0183 heading information to other
external devices such as radars. Heading data is transmitted once per second and provides two
data sentences: HDM (magnetic heading) and HDG (magnetic heading, deviation & variation).
The signal is transmitted at 4800 baud and has enough output to drive one 0183 "listener". For
applications requiring more than one "listener" please contact the factory.
The NMEA 0183 data output format is a two wire signal. One wire (signal) connects to pin 1 of
terminal strip J5 and the other wire (return) connects to pin 2 of terminal strip J5. Terminal strip J5
is located in the lower right side of the SP-70 Processor circuit board (see above). The two pin
connector required for connecting the heading output is included in your accessory kit.
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