CATSIT
- port control: a signal station for the control
of vessels within a port.
- port entry and departure: a signal station for
the control of vessels entering or leaving a port.
- International Port Traffic: a signal station
displaying International Port Traffic signals.
- berthing: a signal station for the control of
vessels when berthing.
- dock: a signal station for the control of
vessels entering or leaving a dock.
- lock: a signal station for the control of
vessels entering or leaving a lock.
- flood barrage: a signal station for the control
of vessels wishing to pass through a flood control barrage.
- bridge passage: a signal station for the
control of vessels wishing to pass under a bridge.
- dredging: a signal station indicating when
dredging is in progress.
- 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.