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Kongsberg EM 2040C
The following calibration should be performed:
• Calibration from shore (in dock or alongside a quay)
• Calibration at sea where integrated system tests are carried out
Positioning system
Most positioning systems are today based on Global Navigation Satellite System
technology (GNSS) such as GPS, GLONASS and/or (later) GALILEO. The location of
the positioning system antenna must be measured, including its height.
Note that some GNSS based systems use two (or more) antennas to provide vessel
heading. Consult the positioning system's installation manual for how these antennae are
to be aligned and how accurately the location of the antennae needs to be measured.
The GNSS antenna offset may in some cases be applied within the GNSS receiver so
that the output position refers to the vessel reference point. Take care not to apply the
correction twice.
The positioning sensor performance must be verified after installation. This includes
verification of the installation location (antenna offsets) to the required accuracy as well
as verification of the stated accuracy of the system.
The following calibration should be performed:
• Calibration from shore (in dock or alongside a quay)
• Calibration at sea where integrated system tests are carried out
Related topics
• Calibration on page 42
• Interface specifications on page 88
Waterline
With the vessel in normal trim, i.e with an indicated pitch angle of zero from the aligned
motion sensor, the distance to the waterline can be measured anywhere on the vessel.
Otherwise it must be measured at the alongship physical location of the motion sensor.
The measurement should be taken on both sides of the vessel and averaged to remove
any roll effects. Simultaneous measurements are required if the vessel is moving.
Sonar head measurements
The EM 2040C Sonar Head has two index marks on the face and on the lid to be used for
measuring its centre point and orientation.
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378789/C
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