Chesapeake Bay - Fish Finder for Archaeology


Greetings Enthusiasts!
Update on the Chesapeake bay expedition. We’ve been playing with fish finders, which have come very far indeed, for use in wreck surveys and pre-dive planning.

Siege of Yorktown, HMS Betsy. In 1988, an excavation erected and then collapsed a cofferdam over the wreck. We want to check it out and learn more about the +50 unidentified wrecks that still lay buried in the York River! The first image is from National Geographic, June 1988, the circular sonar is from a recent survey from JRS Explorations. The bottom 2 images are from our Garmin echomap 44cv.

Have many of you used fish finders in this way? If so, can you help with image analysis?