You never seem to see unhappy people on pontoon boats.

I noticed in this pic that we had the same idea for our GPS mount. I use my iPad mini with Navionics. Nice view also

Floatin- I use the MotionX GPS HD app. (Not the HD Drive version which is for streets only) it has NOAA marine maps for major waterways mixed with topography for land. do I need it on a river like this? Naw. I mainly use it as my DJ station. I subscribe to Spotify, so all of my playlists stream to my M60 with a patch cable.