No one should try to depend on a cell phone app for navigation. If you think some GPS models get poor satellite connection... And, many of the cell phone apps only work with the cell tower connection in addition to satellite. Mine is one. The screen is blank without the cell tower.

Any GPS with map capacity should let you download and upload tracks.
_________________________
"In the beginner's mind there are many possibilities. In the expert's mind there are few." Shunryu Suzuki

http://hikeandbackpack.com