On Sunday, January 12, 2020 at 1:31:26 AM UTC-8, Richard Frawley wrote:
You can feed the S100 with flarm data which has GPS data

This came up elsewhere, and other folks suggested you could not switch the S100 off the internal GPS for basic navigation data.

Do you know for sure the S100 can use that FLARM GPS data for navigation? If so is there any way to select which GPS source is used? The manual seems to not mention this or clarify the GPS source being used. If the connection of a FLARM always have to use the external FLARM GPS that might raise concerns you are not navigating from the exact GPS that is driving the S100 flight recorder (so you are not necessarily seeing exactly the same data... or maybe not noticing any problems). This is a S100 specific question, clearly the S80 etc. use the external GPS data for navigation.