Norway should not force one calibre ashore and afloat

Should Norway harmonize the guns in its shore batteries with the large-calibre weapons on its coastal-defence ships?

Not as a general rule. Shared logistics could help, but equipping every shore battery with large ship guns would be expensive; improved fjord hydrophones are a separate recommendation.

Common guns could simplify logistics if shore batteries and ships shared the same supply arrangements. The difficulty is cost: coastal-defence ships would carry some of the largest guns available, while many shore positions could use smaller weapons. The price difference between 6-inch and 11-inch guns becomes substantial when equipping numerous batteries. A separate recommendation is to update hydrophones throughout the fjords so Norway can hear vessels moving within them.