GAPS - User Guide
8.2 L-USBL Mode
In L/USBL mode, the USBL system feeds a DP with the positions of the acoustic antenna.
● If less than three moored transponders are available then the position is computed by
USBL (see figure below on the left).
● If at least three moored transponders are available then the positioning is provided by both
USBL and LBL computations (see figures below). The LBL computation is made from the
travel distances of at least three moored transponders.
Figure 68 - USBL computation Figure 69 - LBL computation
Depending on the selected output protocol, the LBL computed position is either given with
respect to the position of a reference transponder, or directly the absolute georeferenced
vessel position (with GNSS data available).
136 MU-GAPS-AN-005-H - November 2019
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