Hello, I want an inreach for safety reasons in out of cellular areas. My primary reason is to text or SOS (God willing never need it), I also want to use it as a GPS/navigation to get back to my truck. I think my primary GPS will be my iphone. Full disclosure I have never been camping in a area multiple days without cell coverage or electricity. I have never run GPS off my phone for a prolonged period. I am buying this inreach for this trip (and hopefully future trips). Any thoughts if I need the explorer+ or se+? I am seeing 125 dollar difference in the units and looks like the only real benefits of the explorer+ are better maps? Thanks in advance