5 AOS (5 Air Observer School)
Air Observers were later called "navigators". For recruits in this stream, the training path after ITS was 8 weeks at an Air Observer School (AOS), 1 month at a Bombing & Gunnery School, and finally 1 month at a Navigation School. The Air Observer schools were operated by civilians under contract to the RCAF. For example, Nos. 7, 8, and 9 were run by CP Airlines. However, the instructors were RCAF. The basic navigation techniques throughout the war years were dead reckoning and visual pilotage, and the tools were the aeronautical chart, magnetic compass, watch, trip log, pencil, Douglas protractor, and Dalton Navigational Computer. They trained in the Avro Anson.RCAF.info - RCAF Station Winnipeg Manitoba