[quote=Andinista]GPS for waypoints and navigation is useful, otherwise I agree that looking at your iphone on board is very unpleasant, you will hate it the minute you find yourself dealing with the app instead of sailing.
I would say the major drawback of using a phone is battery duration, which is much better on real GPS. I heard that it's not because of the gps but because of the screen though. If you use it for watching your speed you would want the screen on all the time. But maybe if you use it very occasionally to check your waypoints without keeping your screen on, it might work. If GPS also eats battery (I don't really know) it can probably be turned on only occasionally too.
In my case I will try to use it just for recording tracks and speed for a limited amount of time, whatever is possible without eating much battery, to make sure that the phone is available for calling, the real reason to have it on board.[/quote]
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