Cannot fully trust GPS. Clearest example I recall is if the family that got stranded in the coast range in SW Oregon, in winter. Got stuck in snow. The father died trying to walk out for help.
I recall that incident as well. I don't recall that GPS navigation played a part in it. In 2006, GPS was just beginning to emerge. Cell phones had not yet incorporated the technology to a large extent. The mistake the family made was not realizing that rain at a lower elevation becomes snow higher up, in realizing their error, deciding to take a short cut on a little used road, and when the father tried walking out, not sticking to the roads with no knowledge of the terrain ahead.
Back in the eighties, in late March, I was in Denver with some time to kill and I decided to take a drive in the mountains to the southwest. I was driving a 3/4 t. 4WD pickup and fairly confident if its and my capability. On the way up the mountain, it began raining and it soon turned to snow as I climbed. I turned around at the first possible spot and headed back to Denver.
In early September, 2001, The wife and I were starting back from Yellowstone and because my wife has a fondness for mountains, I decided to come back over the Beartooth pass in the Beartooth Mountains. I had driven that route about the same time of the year thirty years before and it is truly a scenic drive. As we left Yellowstone from the Lamar Valley, it was raining and a few miles outside the park, at a point called Top of the world, there was light snow accumulating on the grass on the roadside. The snow turned back to rain and we decided to continue. As we got into the Beartooth's, the snow began again and developed into a near blizzard. It was a white knuckle drive with me attempting to maintain a steady 40 mph as I negotiated all the hairpins and my wife in the passenger seat praying for the both of us. The goal was to make it back to lower elevatins before dark. We eventually got low enough in elevation that we were in rain again and we had cell phone reception and we called ahead to Sheridan for a much needed hotel room.
It was without question, the most challenging driving that I have ever done. I wasn't too worried about getting stranded as we had full camping equipment with us, including food, water, stove, sleeping bags and warm clothes and we could survive for some time. More of an issue was the possibility of sliding off the road on a slope and ending up some 500 feet below. In retrospect, it was probablyy one of my dumber moves though.
BTW, no GPS back then, only a good set of maps.