I have a galaxy s3 and love it for sailing. I use SailFlow for realtime wind data, Radar Now for realtime doppler and weather/wind forcasts, U.S Tides for tide data, and Marine Navigator Lite (free version) which uses NOAA charts and your phones gps for navigation, speed above ground etc..
The S4 is out now, but is not really worth the extra $$ as it is almost the same exact phone and not much of an upgrade.
I would not "rely" on my phone as a primary tool, it is more or a convience for me. I am in the Puget Sound so the vast majority of my navigation is dead reckoning in waters I am farmilliar with, but it is sure nice having all these tools in my front pocket.
adventures in the Puget Sound aboard my 1975 Aquarius 23'
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