Udo Rumpf wrote:

I need help interpreting the 2006 rules regarding the above subject.
The rules do not discuss a back up flight recorder.
What options exist for a backup flight recorder that would be excepted
across the board in US contests for none team use.
Udo
PS. If you have a used GPS Nav 20 or 25 let me know.

You can use an off-the-shelf GPS unit (handheld, or track log capable
Bluetooth device) that records GPS altitude as a primary or backup
recorder, at any SSA sanctioned contest. You'll need to avoid cutting
the start altitude too close, to allow for the fact that GPS altitude
may be as much as 500 feet higher than indicated pressure altitude, due
to normal pressure altimetry errors.

Marc