Sure.
In Canada, Transport Canada has a very significant marine agency and the DFO/Canadian Coast Guard is another, but there is no one maritime authority in Canada. We have two and we have other federal departments that have involvement with a marine incident.
The point about there being jurisdictional gaps is that the Coast Guard has its mandate, and works specifically within that. Transport Canada has its mandate. There are differences and there are perhaps disconnections between the two.
There is no single entity that is in charge overall in a marine emergency.