My first solo X Country trip yesterday i wish I had had one, I know its sounds bad but I would of used it as a secondary navigation tool. I was going from one headng to another and I was told by ATC I was nowhere near were I was meant to be going. and I had to fly about and find somwhereI knew with a bit of luck to carry on my trip. If i had had GPS I guess I could of verified where I was and made some corrections to carry on without getting totally lost