In reply to TheDrunkenBakers:
The full paid for version of Alpinequest is amazing. It's the only electronic mapping tool you'll ever need when on the fly. I always carry a hard copy of the map for the area I'm in, just in case, but for GPS navigation Alpinequest on my Samsung Galaxy phone is the business.
I actually have a Satmap Active 12 GPS unit, which is utter garbage in comparison to a phone with reliable GPS and Alpinequest. The only thing it loses on is battery life, but that's what portable battery packs are for!