Question 70 GLI03 - Master-LT 500-1600 GRT

The Correct Answer is A. **Why option A ("Merchant Mariner Credential") is correct:** The Merchant Mariner Credential (MMC) is the standard, federally mandated document required for individuals serving on U.S. flagged vessels that are greater than a certain size, carry passengers, or are involved in commercial operations. Even though the vessel operates exclusively on inland waters, it is a commercial towing vessel. Furthermore, the vessel is engaged in significant commercial activity by servicing foreign flag vessels (a form of international commerce support). All masters, operators, and many crewmembers (depending on their specific duties and the vessel's size/horsepower) on a commercial towing vessel must hold a valid MMC, specifically a Towing Officer Assessment Record (TOAR) endorsement or equivalent credential appropriate for the vessel's route (Inland) and horsepower. **Why each of the other options is incorrect:** * **B) No credentials are required since you operate on inland waters only:** This is incorrect. While operating solely on inland waters might simplify certain license requirements compared to near coastal or ocean routes, all commercial towing vessels, regardless of route, are subject to federal credentialing requirements (46 CFR Subchapter M and 46 CFR Part 10). Operating commercially necessitates the MMC. * **C) State driver's license with photo ID:** This is a document used for personal identification and driving motor vehicles. It does not certify the professional competency or medical fitness required for operating a commercial vessel under US Coast Guard regulations. * **D) Social Security card:** This is a document used for employment and tax purposes. It does not certify the holder's professional competency to operate a commercial vessel.