In addition to the rank insignia, Ratings of the RCN wore badges of their trade or "rate". In general, these were identical to badges worn by the RN, however there were some rates that did not appear in the RCN. Ratings of the Royal Canadian Volunteer Reserve wore the same badges as Regular ratings.
1944 rank and rating chart from The Crow's Nest, HMCS Cornwallis Nova Scotia.
1944 chart showing the badges and pay rates for the various ranks and trades.