http://fw.ky.gov/pdf/2012fishguideboatingindex.pdf

This link gives you the reg and general guidelines.

http://www.fishin.com/forums2/album.php?albumid=252
The second link shows an example of where I put them on current and prior boat.

Rule of thumb. Get them up close to the rub rail because you'll be protecting the numbers when you dock from rub offs.

Hope it helps. Party on Garth.