Kongsberg HiPAP 501 Product Description page 44

HiPAP Model 501/451/351/101
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
The system can take the depth from an ROV-mounted
pressure sensor via a serial line. By using this depth in the
computation, it will increase the position accuracy of the
ROV.

The range capabilities of a medium frequency LBL system
will be approximately the same as those of an SSBL system.

LBL positioning will give better position accuracy at greater
water depths, but is more complex to operate, and it needs
more transponders than the SSBL.

LBL TP positioning method uses one transponder to
measure the ranges to the transponders in the array and
telemetry the data to the surface vessel, which computes the
position of the transponder.
Figure 3 LBL principle
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