LT-1000 User & Installation Manual
Quick Installation Guide
Lars Thrane A/S
www.thrane.eu
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Deviation calibration
After completed installation, and before configurating 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 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.
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 following pattern. The best result is achieved
at low speed (SOG), low rate of turn (ROT) and in calm waters.
IMPORTANT: If the LT-1000 NRU is physically moved or rotated, it is required to perform a new calibration.
Refer to the LT-1000 User & Installation Manual on how to use the LT-Service Tool to verify a
subsequent calibration.
Configuration (optional)
Use the LT-Service Tool for optional configuration and offset adjustment of the LT-1000 NRU. The LT-Service
Tool is a PC program (LT-Service_vX.XX.exe) which may run on any Windows PC. The LT-Service Tool is
connected to the LT-1000 NRU via the NMEA 0183 interface, see
Figure 3
.
LT-Service Tool functionality:
F
IGURE
2:
D
EVIATION CALIBRATION PATTERN FOR THE
LT-1000
NRU.
·
Configuration of Heading offset
·
Configuration of Pitch and Roll offset
·
Configuration of Height Above Sea
·
Configuration of GNSS receiver (GPS,
SBAS, QZSS, GLONASS and BeiDou)
·
Status of unit (POST, CM, general status)
·
Monitoring of NMEA 0183 sentences
·
Live Navigation data
·
Generation of a Diagnostic Report
·
Upload of new Application Software
F
IGURE
3:
W
IRING OF THE
LT-1000
NRU
TO A SERIAL PORT
(RS-422).
Step 1
Keep a steady course (± 5°) for min. 10 s.
SOG: 2–12 knots
Step 2
Make a full circle (360-450°) clockwise or
counterclockwise
ROT: 2-6°/s (1 -3 min.)
SOG: 2-12 knots
Step 3
Make a full circle (360-450°) in opposite
direction
ROT: 2-6°/s (1 -3 min.)
SOG: 2-12 knots
Step 4
Keep a steady course (± 5°) for min. 10 s.
SOG: 2–12 knots
Step 1
Step 2
Step 3
Step 4
Start
calibration
End
calibration
Summary of Contents for LT-1000 NRU
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