Well this all depends on the type of yacht and its size. It will always have a masthead light, but after that its all up to the design. It may have flags, a ships whistle (horn) radar, antennas, a crows nest, weather equipment and the list goes on.
The answer is 15.5241747. If rounded, it is 15.5.
mast
This varies by manufacturer, please be more specific.
a mast
Sails are attached to the mast.
Rode
23.2 ft.
the mast and some ropes The sail is attached to the mast, which is in turn supported by stays (lines running from the mast fore and aft to the hull) and shrouds (lines running from the mast to the sides of the hull).
The boom is the horizontal pole attached to the bottom of a sailing boat's mast to which the lower edge of the sail is attached.
Anchor rode, safety line or a mooring line.
A service mast is attached to the building, it stands normally above the building or at the highest point of the building, were no one can get to it. The service mast contains the wires from the meter base to the top of the service mast, this is were the power company attaches it wires so that the building has electricity.
To ease the raising of sails, a pulley is attached to the top of the mast.