I've used the app hunting the past two seasons and always end up using the handheld gps. The app on my phone seems to rarely works and that is even after deleting and reinstalling. It works great in cell range but our of cell range it is a pain. That just my experience though. I will say when it works and loads on the phone it is amazing
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How old is your phone? That might have something to do with it.
I hunted with a guy 5-6 years ago who had the HUNT app on his phone and I don't recall anytime that we felt it was not working correctly even though we were out of cell range for most of the hunt.
I've never seen any reviews on the GPS quality of different phones or tablets, but it wouldn't surprise me if they vary some.
I think it does help to have both GPS and GLONASS, both for accuracy and speed of picking up the satellite signal, and like anything electronic, it improves with each new phone version. I tried out a new high end outdoors watch (SUUNO) and it claimed faster connections and more accuracy having both systems.