If you have more than one GPS source in use at one time, the ForeFlight app will prioritize which GPS source to use based upon a hierarchy. Here is the GPS priority list starting with the highest priority source.
- Dual / Bad Elf
- Other GDL90 (Stratux, Lynx, etc.)
EXAMPLE: If you have a GPS equipped iPad, Garmin, and a Sentry all in use at the same time, the GPS used will be from the Garmin followed by the Sentry and then by the iPad's GPS receiver.