If you are talking about a ship where there is berthing provided (sleeping quarters) you must have 1 lifejacket for every bed. For boats such as recreational vehicles you are supposed to have one for every seat.
I think it would be smart to have life jackets on your boat. Although, you may not want them, someone you have on the boat may want them.
Length of a boat determines the equipment a boat must carry.
All vessels, except sailboards and certain racing shells or rowing skulls, must have at least one wearable Type I, II, III, or V personal flotation device that is U.S. Coast Guard-approved and of the proper size for each person on board. Sizing for life jackets (PFDs) is based on body weight and chest size.
the length of the boat
the length of the boat
where they are readily available
fire extinguisherpaddlelife jackets
Depends what boat your talking about.
A board towed behind a boat is called a Planer.
16 nots
When on board and facing the front of the boat where is the stern
Dog life jackets are useful to have if one is taking their pet onto a boat. Life jackets for dogs are available from pet suppliers such as Petco, Petsmart, WaterDoggy, and Amazon.