Per chevron Azure and Argent over all two flashes in saltire between four fleur-de-lis all counter changed.
(Glossary of Heraldic Terms)
Shawinigan means "portage on the crest". The reverse 'V' shape represents the crest from which the city derives its name. The upper blue represents the calm river above the waterfalls, which are marked by the white. The lightning flashes are from the Arms of the city. The fleur-de-lis is from the municipal flag, but multiplied by four to match that in the flag of the Province of Quebec, where the city is located.
Kingston Class Maritime Defence Vessel
FAIS BIEN CE QUE TU FAIS (Do well what you are doing)
White and Blue
The Second World War
GULF OF ST. LAWRENCE, 1942, 1944; ATLANTIC, 1942-44.
The Insignia and Lineages of the Canadian Forces Volume 2, Part 1 Extant Commissioned Ships, Directorate of History and Heritage, January 1, 2001.