The ships' tasks are mainly maintenance of sovereignty, search and rescue, fishery inspection and support to local (mainly Greenlandic) authorities.

Thetis has undergone a conversion, first to participate in the CANUMAS-project, and later to become the fleet's flagship, a role that ended in September 2007.

The Danish Navy has retrofitted the vessels with 12.7-millimetre (0.50 in) heavy machine guns, Stinger launchers and decoy launching systems.

The ships are assigned to the Navy's 1st Squadron, primarily tasked with the protection of waters around Greenland and the Faroe Islands.

The new vessels will incorporate a modular concept enabling packages of different systems (for minehunting or minelaying for example) to be fitted to individual ships as may be required.