Types of Buoys
Whistle buoys are similar to bell buoys except they carry a whistle
sounded by the seas motion or a horn that is sounded at regular
intervals by electrical means.
Lighted buoys (fig. 4-12) carry batteries and are surmounted by a
framework supporting a light. The framework has no navigational
significance, it simply supports the light and sound equipment. Many
lighted buoys carry a solar panel atop the light to recharge the battery
during daylight hours.
Combination buoys have a combined light and sound signal, such as a
lighted bell, gong, or whistle buoy. Some of the most important
combination buoys also carry a RACON.
Large navigational buoys (LNBs) are disc-shaped buoys that may be as
large as 40 feet in diameter.
LNBs provide a platform for a light, fog signal, radiobeacon, and
meteorological sensors that transmit data ashore. LNBs were developed
primarily to replace manned lightships and light towers.
They are normally stationed many miles from shore and are moved from
time to time. Special attention must be paid to these buoys when laying
coastal and open ocean tracks.