What must be posted or kept for inspection by every commercial operator on duty and in charge of a transmitting system?

• A. The operator's certificate only
• B. A copy of the ship's insurance
• C. The original license or a photocopy
• D. The ship's registration

Answer: (C)

The key idea is that anyone in charge of a transmitting radio on a commercial vessel must be able to prove they’re authorized to operate it. That authorization is the operator’s license, and regulations require it to be on board and available for inspection. A photocopy is acceptable if the original isn’t on hand, so you can always show a valid credential to the inspector. The ship’s insurance or registration don’t prove the ability to operate the radio, and while the operator’s certificate is the credential, the rules explicitly allow a photocopy, making the original license or a photocopy the correct choice.