Quick snapshot while doing other stuff.
update 14/4/2022 I think my bore estimation at a distance skills are still top notch. It’s a party trick that annoys my wife. Show me a gun, I say, I’ll estimate bore and caliber. ( you can say all kinds of rubbish in a blog) . Anyway I just finally identified the gun.
Quote….
The 40mm NC 1 L 60 Gun Weapon System (GWS) has been in the naval inventory since 1943.
https://tridentnewspaper.com/ship-weapons-donated-namesake-cities/
From Wikipedia
The Canadian Forces removed the guns from their surface fleet in the late 1980s when they were considered to be outdated, only to re-use old Bofors guns as the main armament of the Kingston-class coastal defence vessel.[24] The Bofors served as the main armament for almost 20 years.[39]The decision to remove them was made in 2014, due to their maintenance burden, and their lack of stabilization.
Addendum June 5 2022.
Martins comment prompted me to post this pic of nearby equipment.
shooftie 
#1 by Martin on June 5, 2022 - 3:24 pm
Yes, likely an application of the Bofors 40mm hydralic aim launched in 1948 for anti-aircraft defense. The earlier 4036 was hand-cranked, the 48 was (is) aimed by radar and computer. The surveillance radar captures the aircraft target, and transfers to a Raytheon tracking radar. The earliest computers had electro-mechanical trajectory computers, where one could see the resolvers rotating as the aim-ahead angle was computed.
#2 by albell on June 5, 2022 - 5:06 pm
Thank you Martin.
There was a radar unit and canister launcher thing ( forgive me for lack of words) nearby. I’ll add the pics to the post.
Ab