OK, I'll buy that the terrain combined with trees obscured the GPS signals. I've seen it myself. If the unit can't see enough satellites, it can't do its job.

Fog, on the other hand, by itself isn't enough to prevent use of GPS. But fog-wetted tree branches or water covered GPS antenna would be especially tough.

Glad this one turned out so well.

I have my scanners all progammed with 121.5 for the entertainment value. Most transmissions are mistakes. Most beacons are mistakes. But sometimes......