The author of iNavX for the iPhone also has GPSNavX (raster charts) and MacENC(raster & vector charts) for the Mac OSX platform. GPSNavX™ - Marine Navigation & Charting Application for OS X
Works great with the free NOAA downloadble charts in the US.
Info on the iPhone version at iNavX™ - Marine Navigation & Charting Application for iPhone
. There is also a review on panbo.com.
In addition, AyeTides http://www.ayetides.com/
for the iPhone & iTouch will be available very soon.
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