Using data from the Automated Wreck and Obstruction Information System, I developed a heat map of shipwrecks off the coast of the Continental US. The database is not comprehensive, but gives an idea of the relative density of shipwrecks. The highest densities occur in the Northeast, where the 50-mile search radius returned values over 600. The maximum for the scale of this kernel density map is set to 150, so any regions exceeding that value appear as red.

Data source: http://www.nauticalcharts.noaa.gov/hsd/awois.html