It is a FREE kml overlay for Google Earth. Im all about free stuff.
http://nauticalcharts.noaa.gov/
Makes it easy to find those platforms pads after the platform is removed., drop a placemark on the black dot, convert to .usr for lowrance, and in the unit ya go without entering a single number.
All ya gotta do then is head out. But i will tell you this, having sidescan makes finding them faster and easier.
Let me know and I will make a video on how to convert the files.