These are the requirements from state of Ca.
http://www.dbw.ca.gov/Pubs/Abc/reqequip.pdf
Sailboats and Manually Propelled Vessels
Life jackets: Vessels less than 16 feet in length, and all canoes and kayaks,
regardless of length, must carry one Type I, II, III, or V Coast Guard-approved
life jacket for each person on board. They must be readily accessible and
of an appropriate size for the intended wearer.
Vessels 16 feet and over, except canoes and kayaks, must have one Type I,
II, III, or V Coast Guard-approved life jacket for each person aboard, plus
at least one Type IV throwable device. The throwable device must be kept
where it is immediately available. Life jacket must be of an appropriate
size for the intended wearer.
Navigation Lights: All vessels are required to display navigation lights
between sunset and sunrise and during times of restricted visibility. In
inland and international waters, sailing vessels under sail alone shall exhibit
navigation lights shown on page 42. The tricolored lantern and the
all-round green and red lights should never be used together.
A sailing vessel of less than 23 feet (7 meters) in length shall, if practicable,
exhibit those lights prescribed, or have ready at hand an electric torch or
lighted lantern showing a white light which shall be exhibited in sufficient
time to prevent collision. A vessel under oars may display those lights
prescribed for sailing vessels or have ready at hand an electric torch or
lighted lantern showing a white light which shall be exhibited in sufficient
time to prevent collision.
Sound Signaling Devices: A vessel of less than 39 feet 4 inches (12 meters)
is not required to carry a whistle or bell, but must be able to provide some
other means of making an efficient sound signal.