I went to the T-Mobile store online and found at least eight different programs supported by my phone that will give latitude and longitude. That's pretty much all the one I chose does, but it does so at the touch of one icon.
Then I went to Wal-Mart for something else in the electronics section, and found a plug-in power supply for my phone. The package says it will last "up to two hours." That would probably not be more than 30 minutes if running Navionics on it, but if one was smart in an emergency, and only used it for short phone calls and a quick lat and long check (skipping Navionics entirely), and turning the phone off in between, it might last much longer.
It does use a special dedicated battery, so after what I went through in the hospital with a dead phone and (stupidly) no paper list of important phone numbers, I got two spare batteries.
This gadget and its batteries will be dedicated to the boat. If I decide I need one for everyday life, I will get a second one to put in my purse or car (car batteries can cut out on you). It will also go with me any time I sail on someone else's boat.
I'm sure they make such apps for IPhone, and I'm certain they have a supplemental battery pack for IPhones as well.
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