Final answer:
Children under the age of 6 must wear a USCG-approved Type I or II Personal Flotation Device when on the open deck of a vessel in Michigan.
Step-by-step explanation:
In Michigan, the law requires that children under the age of 6 wear a USCG-approved Type I or II Personal Flotation Device (PFD) when they are riding on the open deck of any vessel. It is crucial for parents and guardians to ensure that the PFD fits properly and is securely fastened on the child, to provide safety while on the water. This law is in place to protect young passengers from the dangers associated with watercraft incidents.