By Class Patrol Vessel

The By Class is a class of Ringeriker Ocean-Going Patrol Ship designed to assume patrol duties off the coast of Ringerike fulfilling the roles of fisheries inspection, sovereignty enforcement, icebreaker assignments, environmental protection and other general tasks required of them. The ships lack a hangar for helicopters however can perform refueling operations from their aft flight decks. They are capable of being rapidly up-armed using the system of interchangeable modules that has been adopted across the Royal Ringerike Navy allowing them to take on the role of more capable surface combatants. Four were built for the Navy and six (lacking most of the armaments') for the Coast Guard.