What I usually base on direction is the way a ship is shaped. Borg ships are indeterminable because they are equal on all sides.
Lets take the Star Destroyer. It's pointy at one end with a flat end at the other. To me, the points goes forward. Same applies for a Trek ship. I can't imagine a ship having the bridge right on the biggest part of the ship i.e. the saucer.
So assuming the Narada is shaped like this:
? ? -|-------------------------------------
? --|-----------|
? ---|-----------|-------
? --|-----------|
? ? -|-------------------------------------
Then I'm guessing it goes ---this way--->
Edit: Completely different. 47 is mentioned loads of times in Voyager (vid here
). How many Klingon ships did the Narada destroy? 47 wasn't it...?
