User’s Manual Innomar SES Parametric Sub-bottom Profilers 63
Innomar Technologie GmbH (2020-09) 63
4.11.12 System Setup – Settings – Navigation Input – Transducer Offsets
You may correct offsets if your GNSS position data do not refer to the transducer’s position.
!
IMPORTANT: If offset correction is applied, recalculated position data will replace the
original ones. Those original values are lost and cannot be restored! It is much safer to
apply offsets in post-processing.
Position and Heading Data Source
Selection of “SIS string” IDs for X, Y and Z position values as well as the heading data input. To
avoid wrong position values as a result of transmission errors zero values can be excluded.
The position values are unit-free; preferably metric coordinates (UTM) should be used. There is
an online conversion into UTM coordinates available, see previous section.
The heading value can be obtained either from the motion sensor connected to the topside unit
or from any “SIS string” as defined in the “Navigation Input” dialog. In any case the heading value
has to be in degrees as a number with decimals.
Offset Correction for Transducer
For the transducer an individual offset for the X, Y and Z value can be selected. The offset values
are unit-free but should refer to the same coordinate system as the incoming “SIS data” defined
in “Position and Heading Data Source” above (meters for UTM coordinates).
The offset values are pointing from GNSS antenna to transducer position, the GNSS antenna is
supposed to be at the origin (0, 0); the x-axis points starboard and y-axis points forward.
!
Make sure to select the same coordinate system for the SIS and the offset values!
Coordinate Processing
The only option is to enable or disable the transducer offset correction. The correction is calcu-
lated online every time new position and heading values are received.
Take care! The system will use the heading information as specified by 'Heading Data Source'.
If that data is incorrect (or does not exist), either incorrect position data will be stored or an error
window will show up!
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