Stand-alone GPS or smartphone?

pianotuna wrote:
I prefer using a cell phone--but there are times when there is no cell signal--in mountains etc.

GPS uses a satellite signal, not a cell network signal.

I routinely use my smart phone GPS when I'm WELL out of cell service. As a pilot I'm often "out of service" at only a few thousand feet up.

You just have to have the map database on the phone itself instead of something that needs to fetch the maps as you move along.