People keep telling me to go to places like U9 or N7 on the map! What the heck are they talking about?
Press m and open up your map. Now take note of the letters and numbers on the upper and left hand sides of the map window. See how they form a grid? So if someone says to go to U9, for example, look for the letter U on top and the number 9 on the left and see where they intersect. Thats where you want to go.