Horten was originally designed as a support craft for
submarines and
fast attack craft. After a change in the design, which shortened the vessel and gave her smaller
torpedo stores than originally intended, this role was reduced. Rather than supplying smaller ships with
ordnance,
Horten functioned primarily as support craft with regards to food, fuel and water – in some cases, the on-board facilities were also made available to crews visiting from smaller ships.
Horten was known as a spacious vessel –
privates had four-man cabins,
leading privates had two-man cabins and some
petty officers had single cabins.
Commissioned officers had cabins of a high standard and the
captain a large, separate cabin with top facilities. There were also guest quarters for high-ranking officers on the same deck as the captain's quarters. The officers also had a separate mess hall with a
bar. In 1985, the ship served as yacht for
King Olav V whilst the
royal yacht HNoMY Norge was repaired after a fire earlier that year. Part of the reason for this choice was the ship's excellent facilities. From 1986,
Horten was laid up. When returning to service in 1989, she was converted to a training ship in the "School squadron", along with HNoMS
Hessa and HNoMS
Vigra. The facilities on board and the size of the vessel ensured that
academy cadets could get experience with navigation and command in addition to normal schooling. The ship continued to function in this role intermittently throughout the 1990s and into the early 2000s, as well as serving as a support vessel. During
naval exercises in the early 2000s, such as "Blue Game", the ship functioned as command vessel for
NATO officers responsible for overseeing the exercise. During 2005–08,
Horten primarily functioned as living and training centre for the crews of the new
Nansen class frigates. She had previously served as training ship for frigate crews in 2001, while the
Trondheim was being repaired after a boiler failure.
Horten was decommissioned in 2008, after many years of discussion and postponement due to the lack of a suitable replacement. Due to Norway's strict export restrictions on
dual-use military goods, and the wish of the (FLO) of the
Ministry of Defence to sell her along with six retired (initially still armed)
Hauk-class patrol boats, the sale of the ship turned out to be a lengthy and difficult process. ==Sale to Nigeria==