Thanks. Didn't know that, although I should have, Airplane mode turns off a lot of functions. Now I'll need to remember to turn them back on.
Outside, back in a bit.

Edit: Crow tastes great. The Tom's GPS app works and the accuracy with my iPhone is close enough to not matter. Outside it was showing an accuracy of 10 m; inside it's showing an accuracy of 200 m. Still, close enough for a back-up.