Heaving-to:
To heave-to a vessel you must trim your sails so that the wind presses on one side of one sail and the other side of the other or others. In a boat like a sloop or yawl you can heave-to by drawing your jib a-weather, by slacking off the lee and hauling on the weather sheet. This causes the force of the wind in the jib to counteract the force in the after canvas. By slacking off the mainsheet until a balance of power is established between mainsail and jib a boat will lie almost in one place.