Thanks Lotus, I was just curious. The huge lakes I cruise in have lots of rocks and sunken Islands and its nice to have a reasonable idea of the depth for orientation, realizing of course that depth can change instantly when at speed and that eyes and local knowledge are most important. Also helps in looking for structure for fishing areas when cruising. Thanks again for letting us in on your talents.
Anderson Bay of Rainy Lake, Voyageurs National Park, Minnesota
Lake Kabetogama, Voyageurs National Park