Members of the Ministry of Home Defence, Army, Royal Navy, and Royal Air Force all served in the Map Room. They moved pins on the various maps to indicate where the ships were located, and shifted lines of tape on land maps to show battle fronts. The Map Room constantly recieved updates on the war situation, and it prepared reports on the situation for Prime Minister, the Heads of the Forces, and the King. Churchill's obsession with maps and his need to know the situations around the world made him a frequent visitor to the map room.
A tremendous feat of the day, such modern achievements such as air conditioning, neon lights, an electric cigarette lighter, and a pneumatic tube system led many distinguished guests to visit the map room, including the King and Queen, General Eisenhower, and other Allied leaders.
