Nexus FDX-kit, Installation And Operation Manual

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English NexusRace SW
30
7 Tools
7.1 Calibration
The Calibration only works when the PC is connected to the FDX Server. All calibration
values are stored in the Server.
The calibration may be done manually or automatic. In order to achieve an automatic
calibration some minimum system requirements has to be fulfilled (see more under
automatic calibration)
7.2 Manual calibration
7.2.1 Log calibration
Offset
Offset is the start value for the log and it could be described as slip or friction. Normally
this value is about 0,4 knots and it will be constant at all speeds.
Correction
Correction is the calibration value for the log and has to do with the shape of the hull
and the position of the transducer. The percentage is the value the measured speed
will increased with. As an example: measured speed is 10 knots and the Correction is
30%, the corrected speed will be 13 knots (10 x 1,30)
Advanced corrections
If the log transducer is mounted on one side of the hull, it is likely you will have
different readings on port and starboard. If you tick the use advanced correction box,
the system will use these calibration values for port and starboard. This require a wind
transducer to determine on which tack you are.
Note. If the tick box Advanced Corrections is ticked, you will not be able to set
the calibration value from a NX2 Multi Control. You can only change these
settings from the NX2 Race SW.