So, trying to (a) verify which rules regarding working hours apply to people working on ferries <100 GRT, and (b) get any information in how such rules are interpreted.
46 USC 8104 seems to say that that a master or officer must have 6 hours off-duty in the previous 12 in order to take the deck, and that any licensed individual may not be required to work more than 12 hours in 24 underway.
Assuming this is the only set of rules applicable here, are these rules applied strictly as written? Or does the coast guard ever say, “Well, you’re underway for 45 minutes and then you’re tied up at the dock for 15, so 12 hours is more like 15” or something similarly ridiculous? Because I would read this and interpret it as your shift, including any time at the dock, cannot be more than a maximum of 12 hours, unless there is an actual designated rest period in the middle. Am I wrong?