text: Fire Support Coordination Measures
  position. The FS station designation is used to station ships within boat lanes of the assaulting force, or in
  areas where maneuvering room is restricted by other considerations. A fire support station is an exact location
  at sea within a fire support area from which a fire support ship delivers fire (JP 3-02).
  B-43. FS areas are designed with Roman numerals (for example "FSA I, II, or III") and are graphically
  portrayed on the naval surface FS operations overlay. FS stations are designated by numbers (for example
  "FSS 1, 2, or 3") and are shown on the naval surface FS operations overlay as an "X" indicating the exact
  position of the ship. Figure B-10 provides an example of a graphic representation of the FS area and FS
  station.
  Figure B-10. Fire support area and a fire support station
  ZONE OF FIRE
  B-44. A zone of fire is an area within which a designated ground unit or fire support ship delivers, or is
  prepared to deliver, fire support (JP 3-09). Fire may or may not be observed. Gunfire support ships and units
  are assigned land divided into zones of fire to coordinate their efforts with each other and with the scheme of
  maneuver of the supported ground unit. Units and ships assigned zones of fire are responsible for engaging
  known targets and targets of opportunity according to their mission and the guidance of the supported
  commander.