Kongsberg HiPAP 501 Product Description page 42

HiPAP Model 501/451/351/101
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The transponder position is presented both numerical and
graphically on the operator station. Only one onboard SSBL
type transducer is necessary to establish this position.
Using a pressure sensor in the subsea transponder can increase
position and depth accuracy. The pressure is measured and
transmitted to the surface HiPAP® system using acoustic
telemetry. The depth is then used in the algorithms for
establishing the 3D position. The system can also read the depth
via a serial line input from a pressure sensor. Simultaneous use
of many transponders is made possible by using individual
interrogation and reply frequencies.
Figure 2 SSBL principle
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