Lars Thrane LT-1000 NRU Guide

User & Installation Manual
LT-1000 NRU
Document Number: 95-100178 REV. 1.00
Release date: January 19, 2016
Copyright © Lars Thrane A/S
Denmark
ALL RIGHTS RESERVED

LT-1000 User & Installation Manual
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This Document is of © copyright to Lars Thrane A/S. It contains proprietary information, which is disclosed
for information purposes only. The contents of this document shall not in whole or in part be used for any
other purpose without prior permission from Lars Thrane A/S.
Disclaimer
Any responsibility or liability for loss or damage in connection with the use of this product and the
accompanying documentation is disclaimed by Lars Thrane A/S. The information in this manual is provided
for information purposes only, is subject to change without notice, and may contain errors or inaccuracies.
Manuals issued by Lars Thrane A/S are periodically revised and updated. Anyone relying on this information
should acquire the most current version e.g. from Lars Thrane A/S. Lars Thrane A/S is not responsible for the
content or accuracy of any translations or reproductions, in whole or in part, of this manual from any other
source.
Copyright
© 2016 Lars Thrane A/S. All rights reserved.
Disposal
Old electrical and electronic equipment marked with this symbol can contain substances hazardous to
human beings and the environment. Never dispose these items together with unsorted municipal waste
(household waste). In order to protect the environment and ensure the correct recycling of old equipment as
well as the re-utilization of individual components, use either public collection or private collection by the
local distributor of old electrical and electronic equipment marked with this symbol. Contact the local
distributor or dealer for information about what type of return system to use.
IMO and SOLAS
The equipment described in this manual is intended for use on leisure and commercial marine boats not
covered by the International Maritime Organization (IMO) and Safety of Life at Sea (SOLAS) regulations.

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WARNING - Product installation
To ensure correct performance of this equipment,
it is strongly recommended that professionals, with
expertise, properly trained, and likewise authorized
within the industry is completing the installation.
If the safety precautions and warnings above are not followed, then the product warranty is void.
Safety
Instructions for Installer & Operator
The following safety instructions must be observed during all phases of operation, installation, service and
repair of this equipment. Failure to comply with these precautions or with specific warnings elsewhere in
this manual violates safety standards of design, manufacture and intended use of the equipment.
Lars Thrane A/S assumes no liability for the customer's failure to comply with these requirements.
Instructions for the Installer Instructions for the Operator
WARNING –Turn off power switch
Turn off the main power switch before installing
the equipment described in this manual. Do not
connect or disconnect equipment when the main
power switch is on.
WARNING - Safe navigation
This product is intended only as an aid to
navigation and must never be used in presence to
sound navigation judgement.
WARNING –Do not disassemble
Do not disassemble or modify this equipment. Fire,
electrical shock, or serious injury can result.
WARNING - Compass safe distance
The minimum compass safe distance is 0.3 m. (1’).
WARNING - Permanent watch
In case of smoke or water leaks into the
equipment, immediately turn off the power.
Continued use of the equipment can cause fire or
electrical shock. Keep access and permanent watch
of the equipment in order to prevent any
unwanted escalation.
WARNING - Explosive atmosphere
Do not operate the equipment in the presence of
flammable gases or fumes. Operation of any
electrical equipment in such an environment
constitutes a definite hazard.
WARNING –Keep away from live circuits
Operational personnel must not remove product
enclosure. Do not service the equipment, with the
communication cable connected. Always
disconnect and discharge unit, cable and circuits
before touching them.
WARNING –Power supply protection
Make sure that the power supply is adequately
protected by a fuse or an automatic circuit breaker
when installing the equipment.
WARNING - Turn off the autopilot
During deviation calibration and offset adjustment
of the product, it is strongly recommended to turn
off the autopilot in order to avoid rapid changes in
the heading of the boat.
WARNING –Use supplied cable
Use the supplied power and communication cable
for connecting the equipment.
WARNING –Input Power
The input voltage range is: 9
-
40 VDC.

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Required information for the reader
Throughout this document, essential information will be presented to the reader. The following text
(emphasized) has the following meaning and/or implication:
WARNING: A ‘Warning’is an Operation or Service procedure that, if not avoided, may cause a hazard
situation, which could result in personnel death or serious injury.
NOTE: A ‘Note’provides essential information to the reader.
IMPORTANT: Text marked ‘Important’provides essential information to the reader, and is key information
to the user in order for the equipment to work properly. Personnel injury or damage to the
equipment can occur if instructions are not followed.

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About this manual
Intended readers
This is a User & Installation Manual for LT-1000 Navigation Reference Unit, LT-1000 NRU. The manual is
primarily intended for installers and service personnel.
Personnel installing or servicing the system should be professionals, with technical expertise, properly
trained, and likewise authorized.
All safety instructions and guidelines in this manual must be observed. The safety instructions are listed in
the beginning of the manual. The guidelines are to be found in the separate chapters, where it is needed.
Manual overview
This manual has the following chapters:
·Introduction –provides a high-level description of the product, technology, performance, installation
options, and installation steps to be completed.
·Quick installation guide –a short guide providing a minimum of information to complete an
installation.
·Installation –a complete description of mounting and installation details, with a step-by-step
instruction for both pole and roof mount installations.
·Connecting –a description of the unit connector, 8-pin multi cable, connecting to NMEA 0183,
connecting to NMEA 2000, and connecting the LT-Service Tool.
·Deviation calibration –a description of the deviation calibration pattern to be performed after an
installation (mounting and connecting) and the step-by-step calibration procedure.
·Configuration using LT-Service Tool –a short description of the LT-Service Tool. A PC-program,
communicating over NMEA 0183, which is supporting configuration and maintenance functions.
·Service and repair –a short description of what to do in case of a defective unit.
·Troubleshooting –if the unit is not working as expected, please check this guide to help resolve the
problem
This manual has the following appendixes:
·Outline Drawings
·Performance
·Specifications
·NMEA 0183 Sentences
·NMEA 2000 PGNs
·LT-Service Tool (commands)
·Declaration of Conformity
Software versions
This manual corresponds to the following software:
Software
V
ersion
s
Description Version
LT-1000 NRU 1.01
LT-Service Tool 1.01
T
ABLE
1
:
S
OFTWARE
V
ERSIONS

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Record of Revisions
Rev. Description Release Date Initials
1.00 Original document January 19, 2016 PT

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Table of Contents
INTRODUCTION........................................................................................................................................... 1
QUICK INSTALLATION GUIDE ................................................................................................................. 3
INSTALLATION ............................................................................................................................................ 5
CONNECTING ..............................................................................................................................................20
DEVIATION CALIBRATION .....................................................................................................................27
CONFIGURATION USING LT-SERVICE TOOL .....................................................................................29
SERVICE AND REPAIR..............................................................................................................................32
TROUBLESHOOTING................................................................................................................................33
APP. A - OUTLINE DRAWINGS ...............................................................................................................34
APP. B - PERFORMANCE..........................................................................................................................36
APP. C –SPECIFICATIONS .......................................................................................................................37
APP. D - NMEA 0183 SENTENCES .........................................................................................................38
APP. E - NMEA 2000 PGNS ......................................................................................................................40
APP. F –LT-SERVICE TOOL (COMMANDS).........................................................................................41
APP. G - DECLARATION OF CONFORMITY .........................................................................................42

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Introduction
Congratulations on your purchase of the LT-1000 Navigational Reference Unit (NRU)!
The LT-1000 Navigation Reference Unit (NRU) is a maritime navigation product from Lars Thrane A/S. The LT-
1000 NRU is designed for the leisure as well as the professional maritime markets. The LT-1000 unit meets
all standards and certification requirements needed for worldwide maritime navigation equipment.
Performance
The LT-1000 NRU is a small, compact, and very advanced unit with 12 precision sensors (magnetometers,
gyros, accelerometers, barometer, thermometer, and GNSS). With the use of sensor-fusion and Kalman
filtering, the LT-1000 NRU outputs: true heading, magnetic heading, roll, pitch, position, satellite
information, ground speed, course over ground, air pressure, and temperature in real-time, with high
precision and resolution. The LT-1000 NRU includes advanced technologies such as:
·Kalman filtering
·Calculation of magnetic variation based on the World Magnetic Model (WMM)
·Compensation of soft and hard iron (deviation)
·Built-in magnetometer calibration algorithm
·Receive and track multiple satellite systems (GPS, GPS & GLONASS, or GPS & BeiDou)
·Support for Satellite-Based Augmentation System (SBAS): EGNOS, WAAS and MSAS
The LT-1000 NRU makes use of the latest technology within GNSS receivers, with market leading acquisition
and tracking performance.
The LT-1000 NRU is designed and built for the demanding and rough environment at sea and with an
operational ambient temperature range from -40⁰C to +55⁰C (-40⁰F to +131⁰F).
Installation & Navigation
The LT-1000 Navigation Reference Unit is easy to mount on a 1”pole (optional installation: roof mount) with
a single cable supporting NMEA 0183, NMEA 2000, and power. The built-in magnetometer calibration
algorithm will quickly compensate for heading deviation, and the LT-1000 NRU will output reliable navigation
data. An external LT-Service Tool is available for optional configuration and maintenance of the LT-1000
NRU.
More than 40 years of experience have been put into the design and construction of the advanced LT-1000
NRU, with an exceptional performance and specification level.

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Installation Guide
The following steps, with reference to relevant chapters, will provide you with information, considerations,
and guidance on how to complete a successful installation:
Step 1: Mounting the Unit see Installation on page 5.
Step 2: Connecting the Unit see Connecting on page 20.
Step 3: Calibrating the Unit see Deviation calibration on page 27.
Step 4: Configuring the Unit see Configuration using LT-Service Tool on page 29 and
Mounting offset adjustment on page 31 (optional).
NOTE: A quick installation overview is presented in the Quick Installation Guide on page 3. Here most
of the necessary information is provided to perform a fast installation and take the product in
use. It is recommended to use the entire LT-1000 User & Installation Manual as guidance for
the best possible and complete installation.

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Quick Installation Guide
LT-1000 Navigation Reference Unit
Congratulations on your purchase of the LT-1000 Navigational Reference Unit (NRU)!
The LT-1000 NRU is a small, compact and very advanced unit with 12 precision sensors: Magnetometers,
Gyros, Accelerometers, Barometer, Thermometer, and GNSS receiver.
NOTE: Refer to the 95-100178 LT-1000 User & Installation Manual for detailed information on
installation requirements and guidance.
Unpacking
Unpack the LT-1000 NRU and check that the following items are present:
·LT-1000 NRU (incl. pole mount and cable plug)
·LT-1000 NRU Roof Mount (incl. screws for installation)
·10m Cable Multi 8-pin Simple-Cut (M)
·Screw-in Conn. NMEA 2000 Micro-C (M)
·Quick Installation Guide
·Unit Test Sheet
Installation
The LT-1000 NRU DIP-switch is configured to 4.800 baud (NMEA 0183) and ‘Open’(NMEA 2000) from the
factory. Alternative DIP-switch settings are 38.400 baud (NMEA 0183) and ‘Terminated’(NMEA 2000).
Mounting considerations:
·Mount the unit on a rigid structure with a minimum of exposure to vibration and shock
·Mount the unit in an area with an ambient temperature between -40°C and +55°C (-40°F to +131°F)
·Mount the unit far away from possible magnetic interference and power cables
·Mount the unit so that direct spray from seawater is avoided
·Mount the unit so that ventilation through the pole mount is possible
IMPORTANT: The pinol screw used for fastening the pole mount shall not exceed 0.8 NM (0.6 lbs/ft).
Connecting cables:
The LT-1000 NRU 8-pin female connector and the multi cable (simple-cut) interconnect details are listed in
Table 2 and Figure 1.
LT-1000 NRU Cable and Connector
Pin No. Cable Color Connector Pin
Assignment
1 Brown TxD+
2 Yellow TxD-
3 Black GND
4 White CAN_H
5 Blue CAN_L
6 Orange RxD-
7 Green RxD+
8 Red Vsupply
FIGURE 1: TRANSMIT AND RECEIVE DIRECTIONS FOR THE
LT-1000 NRU.
TABLE 2: MULTI CABLE COLOR AND LT-1000 NRU 8-PIN
CONNECTOR PIN ASSIGNMENT.
Refer to the 95-100178 LT-1000 User &
Installation Manual for
Safety Instructions.
WARNING

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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:
FIGURE 2: DEVIATION 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

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Installation
Unpacking (in-the-box)
Unpack your LT-1000 NRU and check that the following items are present:
·LT-1000 NRU (incl. pole mount and cable plug)
·LT-1000 NRU Roof Mount (incl. screws for installation)
·10m Cable Multi 8-pin Simple-Cut (M)
·Screw-in Conn. NMEA 2000 Micro-C (M)
·Quick Installation Guide
·Safety Instructions Sheet
·Unit Test Sheet
Inspection
Inspect the shipping cartons and/or wooden box immediately upon receipt for evidence of damage during
transport. If the shipping material is severely damaged or water stained, request that the carrier's agent be
present when opening the cartons and/or wooden box. Save all box packing material for future use.
After unpacking the system and opening the cartons, inspect it thoroughly for hidden damage and loose
components or fittings. If the contents are incomplete, if there is mechanical damage or defect, or if the
system does not work properly, notify your dealer.
WARNING: To avoid electric shock, do not apply power to the LT-1000 NRU if there is any sign of shipping
damage to any part of the unit or the outer cover. Read the Safety Instructions at the front of
this manual before installing or operating the unit.
Mounting and installation considerations
For optimum system performance, some guidelines on where to install or mount the LT-1000 NRU must be
followed. It is recommended to mount the unit in a location, with as much free line of sight as possible,
while making sure that the support structure fulfills the requirements for pole or roof mount installation:
·Mount the unit horizontally
·Mount the unit with free line of sight to GNSS satellites. If the Roof Mount is used for below deck
installation, make sure that the unit is capable of receiving signals from the GNSS satellites
·Mount the unit on a rigid structure with a minimum of exposure to vibration and shock
·Mount the unit so that direct spray from seawater is avoided
·Mount the unit so that ventilation through the pole mount is possible
·Mount the unit in an area with an ambient temperature between -40°C and +55°C (-40°F to +131°F)
·Mount the unit away from possible magnetic disturbances (e.g. loudspeakers) and power cables
·Mount the unit at least 1 m. (3 ft.) away from radio transmitting antennas (VHF, UHF, MF-HF,
Inmarsat, Iridium, Transmitting VSAT, etc.)
·Mount the unit at least 50 cm. (20”) away from the following: Engines, generators, steel fuel and
water tanks, bilge pump, anchor, anchor chain, and iron mast support
·Mount the unit with a minimum angle of 20 degrees towards a radar antenna (above or below).
·Mount the unit as close as possible to the ship’s center of gravity and center line
IMPORTANT: The pinol screw used for fastening the pole mount shall not exceed 0.8 NM (0.6 lbf-ft).

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Condensation and water intrusion
If possible, install the LT-1000 NRU such that direct spray of seawater is avoided.
In some weather conditions there may occur condensation inside the LT-1000 NRU. The bottom part of the
LT-1000 NRU is designed to lead water away from inside of the device.
Make sure not to cover the ventilation holes around the connector at the bottom side of the LT-1000 NRU.
These holes are used for ventilation of the construction and for the pressure sensor. Also, make sure that
there is free space around the communication cable through the pole mount.
It is recommended not to use pneumatic tools for cleaning the LT-1000 NRU, especially at a short distance,
and directly at the split between the top and bottom part of the enclosure.
Pole or Roof Mount installation
It is possible to use either a pole or roof mount, when installing the LT-1000 NRU, see Figure 4 (roof mount)
and Figure 5 (pole mount).
The following two sub-chapters will in details, step-by-step, describe how to complete an installation with
either a pole or roof mount
·Pole mount installation, see Pole Mount installation on page 7
·Roof mount installation, see Roof mount installation on page 15
NOTE: The LT-1000 NRU is delivered with both a Pole Mount and a Roof Mount. For further details on
what is in-the-box, see Unpacking on page 5.
FIGURE 5: LT-1000 NRU WITH POLE MOUNT.
FIGURE 4: LT-1000 NRU WITH ROOF MOUNT.

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Pole Mount installation
Step 1: Unpack the LT-1000 NRU and make a record of the unit serial number for support or warranty issues
that could occur in the future.
Step 2: Remove cap for DIP-switch settings. Remember to re-insert the cap after configuration of the DIP-
switch.
FIGURE 6: POLE MOUNT INSTALLATION STEP 1(BOTTOM SIDE OF LT-1000 NRU)
FIGURE 7: POLE MOUNT INSTALLATION STEP 2(REMOVE CAP FOR DIP-SWITCH SETTINGS)

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FIGURE 10: POLE MOUNT INSTALLATION STEP 4(LOCATE AN
APPROPRIATE LOCATION)
Step 3: Please refer to DIP-switch and LEDs on page 21 for correct DIP-switch settings.
Step 4: Locate an appropriate location for the pole mount installation. See drawings under step 4 with
respect to pole mount installation.
IMPORTANT: Make sure that there are no magnetic disturbances (see Mounting and installation
considerations on page 5 for for details) or compass within 0.3 m. (1 ft.) of the LT-1000 NRU.
Mount the LT-1000 NRU at least 1 m. away from VHF, UHF, MF-HF, Inmarsat, Iridium, etc.
radio transmitting equipment. Make sure that the LT-1000 NRU minimum has a 20 degree
angle towards a radar antenna (above or below).
FIGURE 8: POLE MOUNT INSTALLATION STEP 3(DIP-SWITCH AND LEDS)
FIGURE 9: POLE MOUNT INSTALLATION STEP 4(LOCATE
AN APPROPRIATE LOCATION)

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FIGURE 11: POLE MOUNT INSTALLATION STEP 4(LOCATE AN APPROPRIATE LOCATION)

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FIGURE 12: POLE MOUNT INSTALLATION STEP 4(LOCATE AN APPROPRIATE LOCATION)
F
IGURE
13
:
P
OLE
M
OUNT INSTALLATION STEP
4
(
LOCATE AN APPROPRIATE LOCATION
)

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Step 5: Complete the internal or external cable routing. Feed the communication cable through the pole
mount and install the cable plug.
FIGURE 14: POLE MOUNT INSTALLATION STEP 5(INTERNAL ROUTING OF
THE COMMUNICATION CABLE)

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FIGURE 15: POLE MOUNT INSTALLATION STEP 5(EXTERNAL ROUTING OF THE
COMMUNICATION CABLE)