TMA: Target motion analysis. The process of determining a target’s course, speed, and range in order to direct a weapon in its direction.
Tomahawk: Family of long-range cruise missiles used by the U.S. Navy. Several variants exist: TASM (antiship variant), TLAM-N (nuclear land attack variant), TLAM-C (conventional land attack version with high explosive warhead), and TLAM-D (conventional land attack with bomblets).
Trafalgar Class: Advanced class of British Royal Naval SSN. Batch 1 is in service, batch 2 is planned for the next century. Data for batch 1—Top speed: 32 knots submerged. Length: 280.1 feet. Displacement: 5,208 tons submerged. Major weapons: five 21-inch torpedo tubes.
Type 2: Optics-only attack periscope carried on board U.S. submarines.
Type 18: Search periscope carried on board U.S. SSNs. Also contains still and video camera systems as well as ESM and communications receivers.
Typhoon: This Russian nuclear ballistic missile submarine is the world’s largest. The Typhoon is constructed of titanium with a double hull, making it extremely difficult to kill. Top speed: 25 knots submerged. Length: 560 feet, 11 inches. Displacement: 25,000 tons submerged. Major weapons: six torpedo tubes (65cm and 53cm) and twenty SS-N-20 SLBMs.
UHF: Ultra high frequency radio band.
Underwater Telephone: Device that allows two submarines to communicate verbally with each other while submerged and in close proximity to one another. Also allows submerged submarines to communicate verbally with nearby surface ships.
VHF: Very high frequency radio band.
VLF: Very low frequency radio band.
VLS: Vertical launch system used to launch missiles from warships and submarines.
WAA: Wide aperture array. Advanced sonar system, fitted to the Seawolf submarine, employing passive sensors to rapidly determine the location of targets and give more accurate target range and tracking data.
WLR-9: Acoustic intercept receiver. This system is used to alert the crew of a submarine if someone is using active sonar against them.
Ying Ji (YJ-1 and YJ-2): Chinese antiship missiles with a range of over twenty (YJ-1) and sixty (YJ-2) nautical miles.
Z-9 Harbin: Chinese version of the French SA-365 Dauphin II helicopter. Used for ASW. Some Z-9s carry the French HS-12 dipping sonar.
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