The right action to take is for the PWC to change course and increase its speed. There are generally two types of vessels: [1] give -way-vessels: that is those that are required by law to take early and significant actions to ensure that they keep away from other vessels and [2] stand-on-vessels: they are those vessels that must maintain their course and speed unless it becomes obvious that the give-way vessel is not taking any action to keep away. In the question given above, the PWC is the give-way vessel while the sailboat is the stand-on vessel.
