Mikefly -

I have not successfully used a GPS onboard. I tried once on a Midway flight but had an aisle and did not get tracking lock. (I should add my GPS is, by most standards, primitive). Most of my travel is on AA, and they have a formal policy in their "prohibited devices" that says GPS recievers are not to be used onboard.

I haven't tried to skirt that rule, even though I would like to see a heading, altitude, and groundspeed display, which should be available given decent reception.

I think the GPS itself shouldn't be a big deal, but my compass is a 5" tactical sailng compass mounted on a 6" square of plywood (was used in catamaran racing so was a lash on type mounting). I'm worried that this may cause additional scrutiny.

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UAL free since the last millennium - and planning to stay that way!