Luffing or bearing away is presumably the boat's proper course. Luffing When the forward part of the sail is fluttering. Luff The forward edge of a sail. The sail set on the mainmast. The line that controls the angle of the mainsail in its relation to the wind.
Some masts have an external sail track.
Mast step The fitting in the bottom of the boat in which the bottom or heel of the mast sits. Mast tangs Fittings on the mast to which the forestay and shrouds attach. The vertical pole or spar that supports the boom and sails. The top of the mast. Outhaul A line used to haul out the clew or after corner of a sail on the boom.