GAIA GPS

This is the best GPS you can buy for a iPhone by far. I also have Motion X and this is MUCH better. 20$ seems a little steep for what you get but I guess its a lot cheaper than buying a real GPS unit. The ability to download maps is really awesome when your out of cell coverage. It seems accurate within about 50 when I was running a geocache course. It also uses much less battery than other GPSs that I have used.
Great app.

Dotts2 about Gaia GPS Classic, v10.9.5