"Skylune" wrote in message
lkaboutaviation.com...
Stinkpotter checking in! I'm pretty sure grounding on a shoal hasn't been
ruled out entirely.

There was no shoal, it was a chart error showing an incorrect depth. The
charts showed something like 6 fathoms instead of 16 fathoms. Some Great
Lakes depths were sounded in the late 1800s and have not been recharted or
verified since.