A couple of important things to teach your students:
ALWAYS keep one hand on the throttle & one hand on the steering wheel/tiller
STEER then use GEAR
Before excecuting any powerboat manouevre, consider the following:-
Plan - Consider how you are going to complete the manouvre taking into account any hazards, the wind, tide & where you want to end up. Prepare the boat & brief the crew accordingly.
Approach - Consider your angle of approach, speed & any hazards according to the wind direction & strength and tide direction & strength.
Manouevre - Excecute the manouevre i.e. Coming alongside, Man overboard, Picking up a mooring etc
Escape - Always have an escape route! If things don't go according to your plan then you MUST have a way to rectify the situation; whether it be to manoeuvre into a different area, drift away from an object or stop the exercise completely - if you follow the 'Plan-Approach-Manouevre-Escape' method then there should never be a reason for an evasive reaction.
Some downloads you may find useful:-
Teaching GPS on the Level 2 course
Teaching Power Trim on the Level 2 Course
Cold shock, hypothermia & Drowning