I'm working with Maxsea 11, so my screens will be somewhat different from yours, but, here's a few questions:
For your instrument, on the Data I/O Settings, is the instrument selected (checked)? Under "advanced settings" for your instrument, is the "Position" sentence selected (checked)? What "sentence" is selected?
If that all looks good, when you say there's "loads of data" coming in from the GPS, which NMEA sentences are coming across? I believe Maxsea is looking for the GLL sentence for position data.
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