If you have a liquefied flammable gas barge in tow, which is NOT required of you with respect to the barge and its cargo?

Correct Answer: Option D — Verify ullage readings.

Towing vessels managing liquefied flammable gas barges must maintain constant surveillance, inspect bilges periodically, and provide a credentialed officer or certified tankerman. Verifying ullages is an active loading duty typically managed at the facility rather than a required continuous navigation task for the towing vessel.