Ultimately, it is entirely the decision of the charter
company regardless of venue. Certifications are not "required" but do help document training. I suggest contacting the specific charter company and discussing with them.
Most charter agreements request a "skipper's resume" and provide for an optional on the water
check out with a captain
. They also typically have the option of putting a captain
aboard for your charter, at your expense,...should the on the water
check out not go so well.