Well, OK, that's a dumb question. Obviously everyone does, if you want to avoid collisions with other boats. And most sailors do know the rules that determine, in every sailing situation, which is the stand-on boat and which the give-way boat. (As for powerboaters, well, that's a mystery to me - and there are many serious collisions every year and subsequent fatalities when powerboats run into each other....) But if you're new to sailing and unsure of the rules, or if you're an experienced sailor who knows the sailboat rules very well but are studying for your captains license and need to learn all the ColRegs rules for all boats in all situations, then you might find this ColRegs Rules of the Road app for both Apple and Android devices useful.
