GAPS - User Guide
Figure 29 - Measure of GPS lever arms with respect to GAPS
3.4.4 GPS TIME
GAPS automatically updates its internal time. No menu in the Web-based interface enables
you to do it. Two cases can occur:
● ZDA is provided by the GPS: ZDA is the reference for time stamping the position and
attitude delivered by the GAPS
● No ZDA: the last time recorded by GAPS is used
A PPS can be interfaced with the BOX In order to improve the time stamping.
3.5 Installing the Transponders
The transponders are installed on the fixed or the mobile device that you intend to track. The
installation depends mainly on your equipment. Keep in mind that the transponder head must
be as much as possible.
● Free from obstacles
● Directed towards the hydrophones of the GAPS antenna
Please refer to the specific transponder manual. The parameters for installation are to be input
in the Web-based user interface. See section 5.3.2.
46 MU-GAPS-AN-005-H - November 2019
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