Iphone Navionics
This application works great...my Iphone 3G runs it pretty well, there is some hesitation when I zoom in and out on the map...but for 10 bucks to have detailed contours of hundreds of lakes it's a no brainer. It records your location/speed/direction and will show you how far your route was. Basically it has nearly replaced my Garmin with the Hot Spots chip.
Andy
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