On Aug 29, 12:36*pm, "Peter von Tresckow" wrote:
Why not install a GPS logger? It should be relatively easy to download the
data, and then parse it to give times of use.

Agreed. Except the customer in question probably wants to know the
flight time immediately after Joe Glider Pilot 1 lands so that he can
pay and leave. Also, the sooner Joe Glider Pilot 2 can fly the better.
This would make the "download" part less than convenient.

My suggestion: ask the XCsoar guys to implement a "total time in
flight" feature. Then install it on a cheap car GPS and add a battery
pack.

Bart