UN Electronics Designation System

All electronics in the UN naval inventory are given a designation using the UNESDS system. This consists of a designation in the following format: UN/(Environment)(Detector Type)(Detector Purpose)-(Series Number).

   Environments
       F - Spacecraft under 1000 tonnes displacement
       P - PDC
       S - Spacecraft over 1000 tonnes displacement
   Detector Types
       E - Electromagnetic (Non-Thermal)
       T - Infrared (Thermal)
       G - Gravitational
       V - Visible Light (Optical or low-powered laser, for beam targeting)
   Detector Purposes
       M - Missile Fire Control
       B - Beam Fire Control
       N - Navigation Aid (short range, detection only)
       S - Detecting, Range and Bearing, Search (medium range point tracking)
       Y - Surveillance (target detecting and tracking) (long range area-search)