Missing is the part about the ship being a secure area.
Security requirements for emplacement of ground missiles, especially any LR or ABM systems is going to be significantly above what that sites you suggest have, or can practical accommodate.
Missing in most descriptions about Arctic security is the Arctic
‘The Arctic will humble you’
“The biggest challenge we had was how to use our phones,” he said. In the minus 40 degrees C temperature, his hand went numb within 30 seconds of taking off his glove. “I couldn’t even grip the handlebar on my snowmobile.”
“You can be humbled very quickly,” he added. “But then humbled again by seeing a local kid walking around in a T-shirt.”
The biggest threat to security is the locals, the same people that are best equipped to supply security.
And if you go with permanent silos then you have to maintain the silos and unload and reload them at regular intervals. Conversely, slinging in a new container every year or two will keep the rounds refreshed and the depot level maintenance will be done in a nice warm place like Dundurn or some such.
And if the discussion about ice breaking missile platforms is right then I could supply loaded Mk70 PDS systems with 2 SM6 and 8 ESSMs each at every National Airport and Port for less than the price of one of those ships. Those would provide air defence coverage to over 95% of the population if netted in with NAVCAN and NORAD in a CEC environment and, concurrently, supply coastal defence out to the "Classified but greater than 500 km" range. By parking the PDS in recognized airports and ports you are already doing a lot of the security work.
Add in a couple of pods of Maritime Strike Tomahawks Block Vb and you have national coverage against the improbable but not impossible.
If a high volume / high mass threat arrives that depletes local magazine capacity then echelon 2 is the RCAF flying in SM6s/AIM-120s/AIM9s on their F-18/F-35 wings or in more PDSs in C-130/C-17s. Or even civilian B747F freighters.
Or by rail, or road if the situation gets really dire.
The same containers and missiles could also be supplied to any of His Majesty's Canadian Ships, or Expeditionary Forces, or Allies.
Comparing this laydown to the HIMARS laydown posted previously I am leaning strongly towards this solution and leave the HIMARS strictly for the RRCA / Expeditionary Force.
All told there are 30 sites (26 National Airport System and 4 others - Prince Rupert, Churchill, Inuvik and Resolute) each with 4 cells. That equates to 120 cells or the number of cells in 5 of the 15 RCD and loaded with 60 SM6 (SAM/ABM/Anti-Shipping) and 240 ESSMs. Both rounds are used by the Navy. The ESSMs are compatible with NASAMs and the SM6s have a sister version suitable for carriage on wing pylons for the RCAF.
Add in one or two PDS loaded with Tomahawks for the Arctic and, in my opinion, you have the firm basis for a strong system of National Defence.
Guarding against the improbable but not impossible.
And it relies on increasing the number of rounds already in service which should be a priority call in any event. Effectively the proposal increases the number of rounds in inventory but warehouses them in multiple locations in ready to fire condition.
OS Info
All rounds are Active Radar rounds with autonomous onboard terminal homing.
ESSM - 50 km anti-aircraft
SM6 - 240-370 km anti-ballistic missile, up to 500 km in the anti-aircraft role and much more in the surface to surface anti-ship mode.
Tomahawk Vb MST - >1666 km in the anti-ship mode.