The thing to remember is that those directions are used for an awful number of things that have nothing to do with the ship moving. Like when you name places for storing things or various pieces of equipment. Changing those names would create a lot of mayhem.

When I captain a boat it is more important for me to communicate things unequivocally. I need to be able to specify what I want to happen, precisely. The crew does not really need to concern themselves with the direction the boat is moving or what is the bigger plan. They just get orders to do specific tasks. Only I (or whoever is responsible for the boat at the moment) really need to understand the context of those tasks although ideally the crew would also understand why they are doing things so that they can anticipate further orders or signal when I make a mistake.

Why this is important is because the plan may sometimes change and then my job is to put a new set of orders and I can't really start by explaining what the new changed plan is or getting any consent.

I was never in a situation like that, but if I was captaining a boat that can change directions, I would still keep stable naming that does not change when the boat stops or changes directions.