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It depends on the size of the boat and its capacity.
PFD is required for each person aboardWearable PFD for each person aboard
PFD for each person aboard.
PFD for each person aboard.
Carry on board your certificate of numberCarry on board certification and number
Personal Floatation Device for each person aboard
One USCG-approved PFD for each person
a person must be at least 16 to operate a motorboat unsupervised
A life jacket In the US, that would be a US Coast Guard approved Personal Flotation Device (PFD).
One USCG-approved PFD for each person
The class of vessel must be 16 ft or longer to be US Coast Guard approved.
If you place a thermometer by a person skin in a winter jacket it would be warm because the jacket is keeping in the heat.