I had heard about only one of those incidents and cited it in another gps thread.
All three groups were lucky - a few years back, the father died and wife and baby were finally rescued - off course also doing the cross Oregon mt drive in winter.
There's a place crossing the Washington Cascades where two of my gps units seem to want to take a forest service road instead of Interstate 90. What interests me is that I don't believe it actually connects as a through route so the basis of the map data used for both units is probably wrong and maybe the mappers picked up a stream or river and mapped it as a road, even a forest service road.
