Originally Posted by
Ninthace
How so? Unless it has a shadow vessel.
As an indication of ship-borne capabilities, the Astute class sonar is claimed to have a range of 3000 miles (whatever that means in practice). SOSUS, or whatever's succeeded it, is presumably more capable. There's also satellite imaging (this is a surface vessel), ELINT, and plain old radar. I'd be amazed if tracking vessels such as this were even vaguely challenging or anything other than routine.