http://www.flhsmv.gov/dmv/vslfacts.html#3
Exemptions From Registration
Vessels exempt from registration include:
non-motor-powered vessels,
vessels used exclusively on private lakes and ponds,
vessels owned by the United States Government,
vessels used exclusively as a ship's lifeboat.
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Exemptions From Titling
Vessels exempt from titling include:
non-motor-powered vessels less than 16 feet in length,
vessels owned by the United States Government,
federally documented vessels,
vessels used exclusively on private lakes and ponds,
amphibious vessels for which a vehicle title is issued by the Department of Highway Safety and Motor Vehicles,
vessels used solely for demonstration, testing or sales promotional purposes by a dealer or manufacturer,
vessels owned and operated by the state or its political subdivisions
vessels from a country other than the U.S., temporarily using the waters of this state for not more than 90 days and
vessels already covered by registration numbers awarded according to a federally approved numbering system of another state or by the United States Coast Guard in a state without a federally approved numbering system, provided that the vessels are not operated in Florida waters more than 90 consecutive days.