The main firing ramp was used for firing rocket motors/test rigs onto the sandbanks of the estuary. The test rigs would be collected by recovery teams and taken back to the workshops. The firing ramps consisted of concrete plinths supporting overhead steel gantries for the firing track. The accelerating projectile would trigger a high-speed camera located in a dedicated single story observation post (see NPRN 408401).

Maritime Officer, RCAHMW, January 2010