Here’s an excellent review from BackcountryRebels.com:
“Gaia GPS, by far the best GPS app IMO. Maps are free world wide, simply grab an area before you head out, it downloads to your phone, no need for cell service.
You can save an unlimited amount of tracks, show multiple tracks at once in different colors, export them and email them so you can view them in Google Earth.
I use it on EVERY ride, battery lasts all day no problem, just disable cellular data/wifi/bluetooth to increase your batt life while riding.
You can also do track back, place markers with notes, take pictures and it will use the GPS data to place them on the map, etc. Very easy to use as well. My dad had a Garmin 60csx, this app honestly works better (it’s easier to use).
Oh yeah, it’s only $10, works on IOS or Android.“
Couldn’t have said it better ourselves!
http://backcountryrebels.com/showthread.php?p=840664