The C3 Crew Procedure Trainer or Gropes (STC paper No.7)
A series of cubicles preferably simulating the interior of an aircraft, are fitted for navigators and wireless operators.
Pilot acts as a master back plotter and sits at a separate table, or in adjacent cubicle.
Complete flights are undertaken, and operational conditions simulated by the introduction of:
Engine noise (M10 - Synthetic Sound Generator type 1)
Synthetic D/F Bearings (W9 - C100 type 3, D/F Loop trainer), or (W25 - Synthetic D/F Trainer for Harwell Boxes).
Synthetic stars ( (N29 - Synthetic Star Sextant Trainer),
and, if desirable, temperture and pressure variations (as at Cottesmore).
Pin-point, coast lines, enemy aircraft etc, are (when required by each master plotter), projected on a lantern onto a screen visible to the navigators.
Each cubicle flies independently, and lantern slides must be prepared to anticipate all likely pin-points on the pre-arranged flight.
A continuous picture of the ground would be preferable as in the Volarium trainer.