Regardless of any wiz-bang feature that the latest and greatest phone my have, it's absolute worst attribute is that the sumbeech might ring. No thank you, hell no, not now, NEVER. In order to appease my spousal unit that perpetually worries about everything, I do in fact carry a cell phone, turned off, in a zip lock baggie, down in my pack somewhere. If you are an old "geezer" such as myself, hunting without a cell phone is normal, not an exception, I think I was 30+ before I got a trendy car phone.
I live in the middle of nowhere, one night a guy showed up here wet & jibber-jabbering, lost as he could be. He & his buddy both had some cell phone app that tracked each other and the way back etc. Both batteries had died, they were screwed. The app ate all of their resources in an afternoon hunt time frame and he wandered lost, about five miles before he saw my house lights. I helped the first guy find the truck and then the other guy, it's a long funny story that I posted here.
It looks as though the newest cell phones are made so that you can't just throw in a new battery and keep on trucking.
I met a guy at the ramp who had a rather large (to me) cell phone and needed some help, wanting to know if he could get there from here, showing me the aerial imagery on his phone. I informed him that while it may look like a hand could just motor on through, there is in fact a water control structure and you can't. I told him about a reasonable plan "B". He was still in the parking lot dickering with his phone when I motored on, to each his own, new generation.
The GPS will never ring, it may actually float (depending on which model) and you can always throw in a couple of batteries and it will work for days. As to the original poster question, any 2016 model is going to have more features than you will ever use. Floating ability is my primary attribute that I look for, everything else is about the same.
Phone is the debil. I'm seriously considering the "Spot". I can just push a button, everyone knows that I'm alive, I can go on about my business and it never rings. Works camping too, sometimes I hunt a week straight, everybody's worried but me.
Rant over.
boog the caveman.