Kongsberg SPT & MPT 33x Series Transponders

The medium frequency MPT 331 is one of the subsea and seabed elements of the Kongsberg Maritime underwater positioning and navigation systems. It has 56 channels for use with the HiPAP and the HPR 400 systems. 


  • Dynamic position reference for surface vessels
  • Navigation of underwater vehicles and towed bodies
  • Positioning aid for pipeline and underwater structure maintenance and construction
  • Positioning and re-entry of Blow Out Preventers (BOP’s)
  • Riser angle and BOP angle monitoring
  • Telemetry of inclinometers, acoustic release or external sensors
  • Sensor-reading telemetry transponder (depth and temperature)
  • Position-transponder in a Long Base Line (LBL) array
  • Master-slave transponder in an LBL array
  • Transponder Range Positioning mode, where it positions itself
  • Range measuring transponder
  • Responder function


  • Kongsberg MPT 331 DTR DuB 3000m
  • Kongsberg SPT 331 RspSx 110 Vac 3000m
  • Kongsberg MPT 339 DTR
  • Kongsberg MPT 339 RspSx 110 Vac 3000m



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