2 ANS (2 Air Navigation School)
Nos. 1 & 2 Air Navigation Schools offered four-week courses in astronavigation and were the last step for Air Observers.
The RAF schools, Nos. 31, 32, and 33, provided the same training as Air Observer Schools.

RCAF.info - RCAF Station Pennfield Ridge NB
History of 2 ANS Pennfield Ridge NB
2 Air Navigation School was disbanded at Pennfield Ridge April 1942.
Unit was reformed in Charlottetown, Prince Edward Island February 1944. RCAF.info - RCAF Station Charlottetown PEI
RCAF.info - RCAF Station Winnipeg Manitoba
The unit was redesignated No 2 Air Observer School 15 November 1955.
Project 44 BCATP