I don't need a GPS app for a smartphone, I have a Garmin GPS receiver (or 3 or 4 ) for that. But what I found really cool was an App for Celestial Navigation called AstroNav and another called Celestial by Navimatics. Other Apps such as Star Walk, Star Chart and Night Sky will assist in finding the correct celestial body. Very useful as a GPS back-up if you aren't on land. (They work even better on an iPad.) BTW, the iPhone has a very good electronic compass, but I have a real compass too.
I have Google Sky Map on my tablet and love it. One of our other leaders has different version on his smart phone and it's pretty slick. We pulled it out on a hike the other night and figured out that that bright star in the sky was actually Saturn. An app that combined star gazing with navigation would be pretty useful.
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) for that. But what I found really cool was an App for Celestial Navigation called 
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