LT-1000 User & Installation Manual
Deviation calibration
Lars Thrane A/S
www.thrane.eu
27 of 42
Deviation calibration
The magnetometer sensors in the LT-1000 NRU may be affected by magnetic disturbances from the vessel,
which needs to be corrected in order to deliver magnetic heading (and thus true heading). The source of
these magnetic disturbances could be, but not limited to; engines, power cables, etc. This discrepancy
between magnetic and compass heading is called the “deviation”.
Deviation will cause incorrect heading data if not corrected. To compensate for deviation, it is necessary to
complete a deviation calibration of the magnetometers, after installation of the LT-1000 NRU.
IMPORTANT: The LT-1000 NRU will indicate absence of a valid calibration by outputting heading (true and
magnetic) with a 5 degrees resolution. When a calibration has been successful, the heading
will be output with full resolution.
Calibration pattern
F
IGURE
42:
D
EVIATION CALIBRATION FOR THE
LT-1000
NRU
(
OPTION
1
OR
2)
Step 1
Step 2
Step 3
Step 4
Start
calibration
End
calibration
Make circle:
360°-450°
ROT: 2-6°/s.
SOG: 2-12 knots
Sail straight:
±5° for min. 10 s.
SOG: 2-12 knots
Sail straight:
±5° for min. 10 s.
SOG: 2-12 knots
Make circle:
360°-450°
ROT: 2-6°/s.
SOG: 2-12 knots
Summary of Contents for LT-1000 NRU
Page 2: ......
