OVERVIEW: The S 320 *Narhvalen* [Modified Type 205] is a diesel-electric submarine operated by the Royal Danish Navy. Commissioned in 1969, the *Narhvalen* represents a significant modification of the German Type 205 submarine design tailored to Danish operational requirements in the Baltic Sea and surrounding waters.

DETAILS:
The *Narhvalen* class was developed in the late 1960s to replace older submarines in the Royal Danish Navy’s inventory. While based on the German Type 205, the Danish variant incorporated several key improvements and modifications to enhance its operational effectiveness in the shallow and often congested waters of the Baltic. The design philosophy emphasized stealth, maneuverability, and advanced sensor capabilities for anti-submarine warfare (ASW) and maritime interdiction roles. Specific modifications included improved noise reduction measures, updated fire control systems, and enhancements to crew comfort for extended deployments. The *Narhvalen*'s relatively small size and displacement further contributed to its ability to operate effectively in confined littoral environments, making it a formidable asset for monitoring and controlling Danish territorial waters.

The primary roles of the *Narhvalen* centered on anti-submarine warfare (ASW) and anti-surface warfare (ASuW), with a secondary capability for intelligence gathering and maritime surveillance. In an ASW role, the submarine would utilize its M1H sonar, DUUG 1A passive ranging sonar, and advanced fire control system to detect, track, and engage hostile submarines. For ASuW operations, the *Narhvalen* employed its periscope, THD 1030 Calypso II surface search radar, and DR 2000U radar intercept system to locate and target enemy surface vessels. The AN 407 communication suite allowed for secure communication with shore-based command centers and other naval assets. The integration of these sensors with the submarine's 533mm torpedo tubes provided a potent offensive capability against both subsurface and surface threats.

The *Narhvalen*'s operational effectiveness was heavily reliant on its suite of advanced sensors. The M1H sonar served as the primary means of underwater detection, providing both active and passive capabilities for locating submerged targets. The THD 1030 Calypso II radar was crucial for surface surveillance and navigation, especially in poor weather conditions. The DUUG 1A passive ranging sonar augmented the active sonar capabilities, offering a covert means of detecting and tracking enemy submarines by analyzing their emitted noise signatures. The DR 2000U radar intercept receiver provided early warning of approaching aircraft or surface vessels equipped with radar, allowing the submarine to take appropriate evasive action. The Generic Submarine Periscope offered both optical observation and ranging capabilities.

SPECIFICATION: Length: 44.0 m || Beam: 4.55 m || Draft: 3.98 m || Disp: 435 t

SENSORS: M1H || THD 1030 Calypso II || DUUG 1A || DR 2000U || AN 407 || Generic Submarine Periscope || Optical

ARMAMENT: 533mm TT