I'm not sure if this will help you, but i could integrate standard GPS Receivers to work with my FMPro application (not FMGo), i'm using that integration for a transportation company with 75 units
I just received a SXBlue III receiver and I set up a quick FM database with Locationvalue field to check integration with GPS connected via bluetooth to an iPhone on 8 running FMGo.
My first reaction is that the data inserted in the field is not as accurate as the data the SXBlue is generating. Lat/Long is only to 6 decimal places and the horizontal/vertical error readouts are limited to 5 and 10 meters respectively. The SXBlue app on the iPhone shows internal and external GPS data at much tighter errors and 8 decimal places for Lat/Long. Maybe the SXBlue people have some work arounds to mirror SXBlue accuracy in Locationvalues. If so, The power of FM with a sub-foot GPS would make the workflow in the field much more robust.
Since 44 people have viewed your post, there is some interest in your query.