On Dec 5, 7:19*am, son_of_flubber wrote:
1.Why do many gliders have two variometers?

Redundancy. I want the audio of an electronic vario, but electronics
work great until they quit, then not at all. A mechanical vario
becomes very handy at that point.

2.Assuming for a moment that you are not flying in the flatlands, how often and under what scenarios do you use your compass? What are some good exercises for developing airborne compass skills?

Almost never. But almost never isn't the same as never. My compass
'clued me in' when I had rolled out of a very long climb spiral on the
wrong heading. (unfamiliar territory, complete overcast)

3.If you needed panel space for a PowerFlarm display, which existing instrument would you delete (if any)? (Assume a PDA is present.)

No opinion on that one. It would depend on what you had in the
panel.
I've my own answers already of course, but I'd like to have the benefit of your experience/insights.