NMEA position data from Course computer S1G

[Chuck - Raymarine - Moderator]

Peter,

Per the FAQ found here specifying how SeaTalk devices may be interfaced to an a/c/e/eS/gS-Series MFD, the GPS sensor should not be connected to the SeaTalk port of the S1G autopilot course computer. The Raystar 112LP SeaTalk GPS Sensor would be interfaced to an unpowered SeaTalk bus having no more than five devices having a SeaTalk communications interface within the bus. Per the referenced FAQ, should the system feature more than five devices having a SeaTalk communications interface within the bus, then the bus will need to be divided into busses, each featuring no more than five devices having a SeaTalk communications interface. Each SeaTalk bus will be interfaced to the yellow socket of a SeaTalk to SeaTalkng Converter which will be dedicated to that bus. The SeaTalk to SeaTalkng Converters will be joined to one another using appropriate lengths of SeaTalkng Backbone Cable. The SeaTalkng backbone which includes the SeaTalk to SeaTalkng Converters will be powered via a single SeaTalkng Power Cable which will be installed at the approximate midpoint of the backbone's LEN load. The SeaTalk bus(ses) will be powered by the SeaTalkng backbone via the SeaTalk to SeaTalkng Converter(s).

If installed in the manner which I have specified and should the autopilot remain powered ON via its main power cables, then the S1G will bridge GPS data from the SeaTalk bus or SeaTalkng backbone (via the SeaTalk to SeaTalkng Converter) to 4800 BAUD NMEA 0183 for use by the VHF radio. If seeking an installation solution which would only require that the backbone be powered ON (i.e. autopilot powered OFF), then it would be recommended that a SeaTalkng/NMEA 2000 to NMEA 0183 data bridging device (ex. Actisense NGW-1-ISO-STNG, etc.) be installed as a spur to the SeaTalkng backbone and it's NMEA 0183 output leads/terminals then be interfaced to the VHF radio's NMEA 0183 input leads. If seeking to have the MFD automatically plot the positions of DSC position reports, then the NMEA 0183 leads of the VHF radio would need to be interfaced to the NMEA 0183 Port 1 or Port 2 input leads of the MFD's Power/NMEA 0183/Video Input Cable.