Ray,

Is there a means to leave the transponder on?


Yes. It's in the set-up of the transponder. The options a

- turn off when below 30 kts.
- turn off xx seconds after below 30 kts
- don't turn on/off autmagically

The manual for the Garmin GTX330 can be found on their website.

--
Thomas Borchert (EDDH)