CATSIT


  1. port control: a signal station for the control of vessels within a port.
  2. port entry and departure: a signal station for the control of vessels entering or leaving a port.
  3. International Port Traffic: a signal station displaying International Port Traffic signals.
  4. berthing: a signal station for the control of vessels when berthing.
  5. dock: a signal station for the control of vessels entering or leaving a dock.
  6. lock: a signal station for the control of vessels entering or leaving a lock.
  7. flood barrage: a signal station for the control of vessels wishing to pass through a flood control barrage.
  8. bridge passage: a signal station for the control of vessels wishing to pass under a bridge.
  9. dredging: a signal station indicating when dredging is in progress.
  10. traffic control light: visual signal lights placed in a waterway to indicate to shipping the movements authorised at the time at which they are shown.