Abstract
During evaluation of a parametric sonar at the Seneca Lake Facility of the Naval Underwater Systems Center, a very strong and discrete sonar return was observed on the mud bottom at a range of 2000 m. Subsequent use of a conventional side-scan sonar and high-resolution parametric depth sounder suggests the target is a barge which sank during the latter half of the 19th century. The output of the various sonars used are presented as “A” scan photographs and line scan recordings.
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