A vessel within a VTS area is not responding to repeated calls and is deviating from its sailing plan, creating a risk to other traffic. After exhausting standard communication attempts, which of the following is an appropriate next step for the VTS operator as part of a contingency procedure?

1. Request immediate intervention from maritime law enforcement or Coast Guard patrol assets.
2. Broadcast a SECURITE message warning other traffic of the vessel's unpredictable behavior.
3. Instruct another vessel in the vicinity to intercept the non-compliant vessel.
4. Immediately de-activate the vessel's AIS transponder remotely to reduce screen clutter.