Plotting room

A plotting room (see photo at top right) was used by the U.S. Coast Artillery and The Coastal Forces of the Royal Canadian Navy to house a team of soldiers who were engaged in controlling fire for the guns of a Coast Artillery battery.

A plotting room was connected by telephone lines (and sometimes by radio) to base end stations (at left, top) that observed the locations of enemy ships and sent data to plotting room soldiers who used equipment like a plotting board to calculate where the guns should be pointed and when they should be fired.