HI Brewman,
In front of Donnybrook on the stbd side coming out from DBrook before the yellow X. If you can't see the bank it's too late. Be very careful at low tide - prop eating rocks & stuff on the bottom of the channel.
Opposite Spinnaker Sound on the island side. Near the anchorage.
Opposite Mission Point.
Try to pump on a rising tide. Critters are not that far down & you won't get stranded.