Oste-class fleet service ship

The Type 423 Oste class are purpose built signals intelligence (SIGINT/ELINT) and reconnaissance ships of the German Navy.[1] Officially designated as "fleet service ships", they replaced the Type 422 class.

A52 Oste
A52 Oste in 2006
Class overview
BuildersFlensburger Schiffbau-Gesellschaft, Flensburg
Operators German Navy
Preceded byType 422 class
In commission1988–
General characteristics
Displacement3,200 tonnes
Length83.5 m (273 ft 11 in)
Beam14.6 m (47 ft 11 in)
Draught4.2 m (13 ft 9 in)
Propulsion2 diesel engines, 3,300 kW (4,400 hp) each
Speed21 knots (39 km/h)
RangeMore than 5,000 nautical miles (9,300 km)
Complement36 + up to 40 mission specialists
Sensors and
processing systems
Electronic warfare
& decoys
Electronic countermeasures[specify]

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.[2] Later she was seen in Greenwich, UK in February 2017[3]


  1. ^ "Oste class". Military Today. Archived from the original on August 20, 2022. Retrieved August 20, 2022.
  2. ^ "Kein Spionageboot vor Syrien", tagesschau.de (in German), 19 August 2012, archived from the original on August 19, 2012
  3. ^ "Lookout – Events & Visitors". February 2015.