First and foremost, you should check to see if you or anyone else is seriously injured and call for help. If anyone has fallen overboard, you should assist the victim back onto the boat if possible. Check to see if anyone aboard other vessels involved in the accident require medical assistance. You should be wearing a life jacket on at all times. The Coast Guard should be contacted immediately. Let them know that an accident occurred, where the accident is located, and what medical assistance is needed.