Navionics has their maps for Iphone for $9.99
Anyone using it? I think its the same maps you can put on your sonar units.
I dont have an Iphone so it wouldnt be able to use the GPS features, but I think it would still be cool to put it on my Ipod touch, so I can see the lake details.
http://navionics.com/MobileLakeFeatures.asp