[LW] [LW11] Ray70 not receiving NMEA 0183

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When my instruments are turned on my Ray 70 sucessfully receives position data over the STNG network. When the radio is on and the instruments are turned off the radio should get position data from its own internal GPS but this appears to be either faulty or fails to pick up a GPS signal, (it used to when new); when I can in the future I will take it to a dealer to have this investigated. In the meantime I want the radio to receive position data over NMEA0183, 4800 when my instruments are turned off. I have connected the radio to a NMEA 0183, 4800 source on a multiplexer that I know to be working as the position appears on my SSB radio, unfortunately the Ray 70 still reports ‘no position data’.
I appear to have two issues here, firstly the internal GPS is not working and secondly the Ray 70 is not correctly receiving position data over NMEA 0183, although it will receive position data over STNG when its available.
To summarise my question how can I get position data over NMEA 0183 into the radio?