“Those missiles and torpedoes need some kind of active or passive seeker head, which they of course have.”
Inertial guidance is pretty good. In the sixties my ship left Mayport Florida did a 9 month Med cruise and docked at a different dock when it got back. The SINS system knew all about it. This was WAY before GPS.
Yes it can be, but generally not a system that needs a Boomer to carry it around. A missile sized one is not that great... but probably good enough for "fly out" purposes.