Chart depth of False Creek above the Granville Bridge is 4 to 7 metes; very protected. Probably mud bottom.
Look at you studying up on my backyard
You are correct, it is a very good anchorage which is why it is filled with boats in the summer and a fair number across the winter as well. It was even more crowded when the squatters left their derelicts in there for months at a time but we finally took care of that.
As sheltered as it is, the locals on here will know the wind in the summer typically blows in from the northwest, which is pretty much directly into False Creek. Ralph, you'd be surprised at the gusts you can get in here sometime. That said, this boat clearly wasn't anchored well or had a ground tackle failure and was probably too close to shore as well. Plus as someone said, those cats have a lot of windage right?
The coast guard has been cruising around all morning checking up on all the boats.