Can I use ForeFlight with a Garmin GTX-335?

The GTX-335 ADS-B Out transponder does not have Bluetooth connectivity, so it can not connect and send data to ForeFlight Mobile.  The GTX-335 will work well in combination with Sentry or Scout portable ADS-B receivers; the GTX-335 provides ADS-B Out, while the Sentry or Scout will let you view ADS-B In data in ForeFlight Mobile.