Wind indicator for Keel Boats - 15" Model. A lightweight balanced vane arm mounted above two reference arms enabling the helmsman to accurately judge the angle of the apparent wind to the boat.Mast Clip for fitting to either a horizontal or vertical surface. Indicator can be removed and replaced by a single screw without loss of alignment. Parralax free reference arms, positively lockable at angles of 55, 60, 65 or with friction lock at any angle.