Knowing how to rescue a man overboard is imperative. Knowing if you can rescue a man overboard is just as important. What's the difference? The ability to physically get a person from the water-- a person who may be injured, exhausted and much heavier than you--is not a given. The variables are many. Practice getting an "MOB" into your boat with your crew in calm waters in order to develop strategies that will work for you, aboard your own boat.