Oste-class fleet service ship

The Type 423 Oste class are purpose built SIGINT/ELINT and reconnaissance ships of the German Navy. Officially designated as fleet service ships, they replaced the Type 422 class.

A52 Oste
A52 Oste in 2006
Class overview
Builders: Flensburger Schiffbau-Gesellschaft, Flensburg
Operators:  German Navy
Preceded by: Type 422 class
In commission: 1988–
Completed: 3
Active: 3
General characteristics
Displacement: 3,200 tonnes
Length: 83.5 m (273 ft 11 in)
Beam: 14.6 m (47 ft 11 in)
Draught: 4.2 m (13 ft 9 in)
Propulsion: 2 diesel engines, 3,300 kW (4,400 hp) each
Speed: 21 knots (39 km/h)
Range: More than 5,000 nautical miles (9,300 km)
Complement: 36 + up to 40 mission specialists
Sensors and
processing systems:
Electronic warfare
& decoys:
Electronic countermeasures[specify]
Armament: None

Accommodation for the crew was designed to civil standards, and the Oste class offers much more comfort for the crew than other ships in the German Navy.

List of shipsEdit

Ship Pennant
Call sign Launched Commissioned
Oste A52 DRHH 30 July 1988
Oker A53 DRHG 10 November 1988
Alster A50 DRHF 14 November 1988 5 October 1989

The ships were built at Flensburger Schiffbau-Gesellschaft in Flensburg.

All ships are currently based in Eckernförde and belong to the 1st Ubootgeschwader (1st Submarine Squadron) stationed in Eckernförde. The vessels received the same name and pennant numbers as the three Type 422 class vessels they replaced. To avoid the confusion, the ship names are sometimes suffixed with II.

Oker (A53) was reportedly spotted near the Syrian coast in August 2012.[1] Later she was seen in Greenwich, UK in February 2017[2]


  1. ^ [1] Archived August 19, 2012, at the Wayback Machine
  2. ^ [2]
  • "Flottendienstboot OSTE-Klasse" (in German). Deutsche Marine. Retrieved 5 August 2008.