Often the fastest way downstream is your boat. When sending someone for help, take a few minutes to prepare a message with all of the vital information like name, contact information, location and directions, time of the accident, what you need (this is really important), patient condition and vitals, etc. Practice the sales pitch a few times so you can deliver it with confidence. Send two boaters instead of one so they can help each other if necessary. If they need to drive, don't forget the car keys. The Wilderness First Aid class trains first aid responders the Patient Assessment System (PAS) and the use of a SOAP Form. I highly recommend printing and packing these in your first aid kit.