What navigator? Last I knew, navigation was still a collateral duty for officers on USN surface ships! And a hearty "Hear, Hear!" to your point on the NtM. There's only one chart on board at any given time that must be up to date; the one you're using. Anyone who insists on updating the entire portfolio is either a pencil-pushing bureaucrat or a moron. Especially where the ship operates as the Navy does their's.
You correct the charts for the proposed voyage to San Francisco and then, when orders change, you correct the charts for Puget Sound. If you never get orders for Puget Sound you haven't wasted a bunch of time updating a chart for which a new edition will likely come out before you ever go there.
It's hard to believe that you can have an entire sonar department as well, yet no one is tasked with "job one" with monitoring water under the keel!
Unfortunately for the Navy they periodically have these incidents when the mission of the moment seems to eclipse the practice of good seamanship. It's an organizational thing, that makes things like navigation a collateral duty. From personal experience it would come as no surprise to me if a friendly call on the VHF saying, "Hey, Capt., 'yer runnin' outta water over there" wouldn't be heard either. Monitoring the VHF is for mere mortals too. The kind who have the bridge fathometer running.
“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.