Anything above the number one is considered a fleet.
A group of boats is a fleet.
All of the boats commissioned for the First Fleet made it to Australia.
A Fleet
The Navy has the fleet & that will never be publicized for obvious security reasons.
It is called a fleet.
a fleet
the boats were very fleet so the sea police gave them a ticket
The officers, marines and sailors on the First Fleet were permitted to get off the boats at the various stops along the way, but convicts were never permitted off the boats.
Flotilla, Regatta, Squadron,
A lot of boats is commonly referred to as a "fleet." This term can apply to various types of watercraft, including ships, yachts, or fishing boats, and signifies a group that operates together. In specific contexts, such as the Navy, a fleet may also refer to a large formation of warships.
A collective noun is a noun used to group people or things in a descriptive way.A collective noun is not used for a singular noun such as 'boat'.The standard collective noun for boats is a flotilla of boats.
See this website:http://en.wikipedia.org/wiki/Roman_Navy#Ship_types