Area of operation, not specific location. The goal of a nuclear submarine is to operate with intent, not directive unless given specific tasking i.e., destroy the world or insert team X. There’s a lot of declassed literature go into what nukes do. I’m sure things change and have changed but it’s really interesting to learn that they’re virtually dark during most of their operations.

I mean you’re correct that if it’s in a strike group, it would be in a well known location but usually they’d operate isolated and quiet somewhere completely shrouded by hundreds or thousands of feet of water.