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Problem with using phone's is when out service. You have nothing.
I bought the Montana 650T and it is wonderful and huge. Too huge though! So big that I keep leaving it out of my pack! I would get the Oregon version with what I know now. My buddy had the Rhino I think. If that's the one that has the radio in it too. The idea behind the GPS and radio all in one unit is good but his radio had medium to lower power and he couldn't transmit near as well as our just plain radios so now he has to use his Rhino and a separate radio. spend the extra money on a better GPS and not on the radio part if you ask me.
I ended up getting a Garmin 64 ST. I really like it! I wanted to use my phone with the onx map app, but my iPhone dies super quick when using the GPS. I find it easier to use my hand held all day and it runs on 2 AA batteries. I think it'll last around 16-18 hours of constant use.. It's easier for me on a multiple day hunt to change a few batteries than worrying about how I'm gonna charge my phone or how many charges I have left on my Akor battery pack.. I have an onx chip for my 64 ST and I really like it..
I remember the good ol' days when hunters never relied on a GPS, just knowing the land and where they're at was all you needed to know.. Boy, have things changed.
I don't rely on it. It's on with the screen turned off.It tracks and i download its tracks to my laptop and overlay them to see where i was that day and where i saw elk.