LT-1000 User & Installation Manual
Deviation calibration
Lars Thrane A/S
www.thrane.eu
28 of 42
Calibration procedure
After completed installation, and before configuration of the LT-1000 NRU heading offset, it is required to
perform a deviation calibration. The calibration must be performed in open and calm waters, and will
determine the ship’s influence on the magnetic sensors.
The LT-1000 NRU will automatically perform a calibration when it detects the vessel is sailing a specific
pattern. To trigger a calibration, guide the vessel through the patterns (option 1 or 2), which are illustrated in
Figure
42
.
NOTE:
The best result is achieved at low speed (SOG), low rate of turn (ROT) and in calm waters.
Procedure (step by step):
Step 1:
Keep a steady course (± 5 degrees) for minimum 10 seconds
SOG: 2–12 knots
Step 2:
Make a full circle (360-450°) clockwise or counterclockwise
ROT: 2-6 degrees/second (1 -3 minutes pr. circle)
SOG: 2-12 knots
Step 3:
Make a full circle (360-450°) in opposite direction
ROT: 2-6 degrees/second (1 -3 minutes pr. circle)
SOG: 2-12 knots
Step 4:
Keep a steady course (± 5 degrees) for minimum 10 seconds
SOG: 2–12 knots
If the calibration fails, please repeat step 1 to 4 again.
NOTE:
In order to get the best possible heading accuracy on the LT-1000 NRU, it is required to
compensate for the heading mounting offset. The LT-Service Tool is supporting this
functionality, see Configuration using LT-Service Tool on page 29 and Mounting offset
adjustment on page 31.
IMPORTANT: If the LT-1000 NRU is physically moved or rotated, it is required to perform a new calibration.
Otherwise, the deviation calibration will not be valid.
NOTE:
In order to verify that a subsequent deviation calibration has succeeded, see Verify a
subsequent deviation calibration on page 31.
Summary of Contents for LT-1000 NRU
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