You are in charge of a towing vessel that operates exclusively on inland waters. You regularly tow barges that provide services (cargo lighters, fuel barges, etc.) to foreign flag vessels in port. What will be accepted as proper credentials for you and your crew?

Correct Answer: Option D — Merchant Mariner Credential

Pursuant to 46 CFR and statutory manning laws, personnel operating commercial towing vessels on navigable waters must hold a valid Merchant Mariner Credential regardless of whether their immediate service involves foreign flag vessels.