Since you don't ski over water, you don't need one.
16 feet or longer powerboat is required to carry one type IV throwable PFD.
A type V (5) PFD is a Special use, or windsurfing PFD.
sking
offshore PFD
PFD is required for each person aboardWearable PFD for each person aboard
Type, I, II, or III PFD
A characteristic of a type 3 PFD is that it will turn a passed out person face up.
The main advantage of type IV PFD is that it is designed to be thrown to someone in trouble.
A characteristic of a type 3 PFD is that it will turn a passed out person face up.
A Type III PFD will not turn most unconscious wearers face-up
Water sking
Every time the PFD is worn