Used by RAF and RAAF during WWII Believed to have been used in the battle of britainMetal faced bakelite box with rotating dial on front and a paper graph sheet enclosed in front cover a pencil for plotting course and position is attached to the side of the unitNavigational Computer ICANican computer, battle of britian computer, aircraft computer, mechanical computer

Item used by Navigators or Pilots of small aircraft. Belonged to Maxwell Lennox MATHESON 418447 RAAF. Refer Cat No1959 for his service history.NAVIGATIONAL Computer Mark III.D, metal - bakelite, construction rectangular box shape, top lid hinges open. Top lid has a circular adjustment. Inside has another circular adjustment. Centre is a graph in red which winds by a dial on side. Inside top lid hand written in black are items of Navigation."NAVIGATIONAL Computer MKIID REF No 68/180 ICAN CALIBRATION"electrical technology, appliances & accessories, navigational