In honor of my birthday today, a kind and anonymous ATP member has donated a gift membership and asked me to give it away in the style of John's trivia games.

Rather than doing a frame game, I'll do a different kind of trivia:

In "The Hunt for Red October", what is the grid square reference number that the Red October and the Konovalov are supposed to rendezvous at/in?

First one to answer gets the gift code, or if you're already a member, gets to continue the game.