I've never done marine navigation so how I expect it to work just comes from movies and the occasional reality TV show so how I'm imagining it works may be way off, but the impression I've gotten is that the navigator (by which I mean the person planning the route) and the driver (the person or people who execute the navigator's plan) are logically separate. They might be the same person on a smaller boat, but the processes is still separate.
The navigator uses the maps to produce instructions for the driver which will be things like sail in this particular direction until we pass that specific island then turn some specific amount and so on.
The navigator doesn't even have to look outside while doing this, and all the directions are specified by compass points, so of course a north on top map makes sense.
For a car nav system the nav system is both doing that high level planning that a ship navigator does and is doing very low level navigation for the driver, and the driver is executing the plan by looking out the window and matching what they see to what the plan calls for. Also events are happening much faster in a car, because (a) cars are typical traveling faster than boats, and (b) cars are typically in environments with a lot more obstacles, and (c) those obstacles are more closely spaced than typical ocean obstacles. For telling someone how to turn right now most people will do better with "turn 90 degrees right" or "turn left at the upcoming intersection" than instructions to change their heading to a specific compass direction.
So far a car nav system it does make more sense to make the nav device's view match more closely what the driver sees.
Ideally I'd like something that switches views depending on the situation. Say I'm driving from the Seattle to Los Angeles. When I'm cruising down I-5 a north up map view zoomed out so I can see the big picture would be great. If I decide to stop in Sacramento for gas and a snack, then switching to a smaller, current direction up, view just big enough to show my current position and the gas station when I exit I-5 would be more useful.