I found this on the navionics website. It's awesome as long as you can convert Metric to feet ion your head. Just remember that 3.2808 feet is in a meter so just over a yard is 1 meter. When you see 4 on the contour, it's actually about 13 feet deep. WebApp | Navionics It's got the big 4, Barnett, Eagle, Okatibee, tenn-tom waterway and several other lakes in Mississippi