Page 23 of 40
CU-M001 User manual
CALIBRATION
Calibration needs to be performed when the system is new or service has been performed on the
sensor mounting
Calibration is designed to adjust for differences of mounting and hydrodynamics (water ow around
the vessel). The mounting will have a tilt, it will be offset in heading and the water drag of the ship
may cause some variations. Mounting parameters are xed, and speed changes due to drag are
usually linear with speed. In most cases a single calibration is adequate, however on some vessels
more may be required.
Speed logs are calibrated in the factory to give reasonable results after installation, however
installation and hydrodynamics vary from vessel to vessel. It is therefore necessary to calibrate
speed logs once in place.
SKIPPER speed logs have 4 parameters that need to be corrected by calibration.
1. Temperature.
1. Angular sensor installation angle (heading error)
2. Speed calculation
3. Tilt
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