iXBlue GAPS - Page 214

GAPS - User Guide
Immersion
definition
The immersion corresponds to the mobile depth with respect to the mean sea level (thus
heave corrected). This data is coherent with the one that would be given by a depth sensor on
the underwater mobile. But it does not allow to deduce the absolute position as there is no
compensation for tide.
Immersion = Measured depth (by the USBL acoustic array) - Heave + USBL immersion
214 MU-GAPS-AN-005-H - November 2019