EQUIPMENT : Sensors : Acoustic Positioning
Simrad HPR 418 - Hydroacoustic Positioning Reference

Combining the Super Short Base Line (SSBL) and Long Base Line (LBL) principles to accurately measure the position of a subsea transducer relative to the vessel of opportunity.
Kongsberg Model 319 Transponder

The Mini SSBL transponders are medium frequency mini-transponders that are to be used with either HiPAP or HPR systems when a small and lightweight unit is required.