Obviously, slow down. Be very alert and carefully judge the situation.
A sailing vessel operator when approaching a pwc head on should slow down and change course.
There are several precautions that an operator should take when approaching a blind corner. The first thing is to slow down and then approach the corner from the furthest angle.
Use low beams.
A train operator should blow their horn when approaching crossings where cars or pedestrians may be. They should also always have their lights on.
A sailing vessel operator should sound a blast on the horn when approaching a PWC head on. However, it is up to the operator of the motorized craft, in this case the PWC, to take evasive action.
When approaching a sailing vessel head on, it is up to the motorboat to yield. The motorboat operator should swing wide as early as possible to stay well clear of the sailing vessel.
look both ways carefully.
turn off headlights and leave parking lights on
The sailboat operator is the stand-on vessel so they should keep their course and speed while the PWC is the give-away vessel so it should change course and speed.
Stay far enough away that the large vessel's helmsman can see you.
4-way stop
4-way stop