Lars Thrane LT-300 Guide

User & Installation Manual
LT-300 GNSS Receiver
Document Number: 95-100229 REV 1.00
Release date: March 23, 2016
Copyright © Lars Thrane A/S
Denmark
ALL RIGHTS RESERVED

LT-300 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.
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 instead of
sound navigation judgement.
No one navigation device should ever be solely
replied upon for the navigation of a vessel. Always
confirm position against all available aids to
navigation, for safety of vessel and crew.
WARNING –Do not disassemble
Do not disassemble or modify this equipment. Fire,
electrical shock, or serious injury can result.
WARNING - Compass safe distance
The compass safe distance for standard and
steering compasses is 0.3 m (1 ft). Observe this
distance to prevent interference to a magnetic
compass.
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 –Use only the supplied cable
Use only the supplied power and communication
cable for connecting the equipment.
WARNING –Input Power
The input voltage range is: 9
-
40 VDC.
If the safety precautions
and warnings above
are not followed, warranty
will be
void
.

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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 the LT-300 Global Navigation Satellite System Receiver, LT-300 GNSS
Receiver. 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.
·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 Versions
Description
Version
LT
-
3
00
GNSS Receiver
1.01
LT
-
Service Tool
1.02
T
ABLE
1
:
S
OFTWARE
V
ERSIONS

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Record of Revisions
Rev. Description Release Date Initials
1.00 Original document March 23, 2016 PT

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Table of Contents
INTRODUCTION .............................................................................................................................................1
QUICK INSTALLATION GUIDE ...................................................................................................................3
INSTALLATION...............................................................................................................................................5
CONNECTING ............................................................................................................................................... 19
CONFIGURATION USING LT-SERVICE TOOL...................................................................................... 26
SERVICE AND REPAIR ............................................................................................................................... 29
TROUBLESHOOTING ................................................................................................................................. 30
APP. A - OUTLINE DRAWINGS ................................................................................................................ 31
APP. B - PERFORMANCE........................................................................................................................... 33
APP. C –SPECIFICATIONS ........................................................................................................................ 34
APP. D - NMEA 0183 SENTENCES.......................................................................................................... 35
APP. E - NMEA 2000 PGNS ....................................................................................................................... 37
APP. F –LT-SERVICE TOOL (COMMANDS) ......................................................................................... 38
APP. G - DECLARATION OF CONFORMITY.......................................................................................... 39

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Introduction
Congratulations on your purchase of the LT-300 Global Navigation Satellite System (GNSS) Receiver!
The LT-300 GNSS Receiver is a maritime navigation product from Lars Thrane A/S. The LT-300 GNSS Receiver
is designed for the leisure as well as the professional maritime markets. The LT-300 GNSS Receiver meets all
standards and certification requirements needed for worldwide maritime navigation equipment.
Performance
The LT-300 GNSS Receiver is capable of providing positions with an accuracy better than 2 meters. The LT-
300 GNSS Receiver outputs navigation data (up to 10 Hz): UTC time and date, position, course over ground,
speed over ground, GNSS satellite information and magnetic variation, in order to give your vessel smooth
navigation capabilities. The 72-channel GNSS receiver benefits from advanced technologies such as:
·Receive and track multiple satellite systems (GPS, QZSS, GLONASS, and BeiDou)
·Support for Satellite-Based Augmentation System (SBAS): EGNOS, WAAS, and MSAS
The LT-300 GNSS Receiver is designed and built for the extremely demanding and rough environment at sea
and with an operational temperature range from -40⁰C to +55⁰C (-40⁰F to +131⁰F).
Installation & Navigation
The LT-300 GNSS Receiver is easy to mount on a 1”pole or roof-mount, with a single cable supporting NMEA
0183, NMEA 2000, and power. The LT-300 GNSS Receiver can be configured to either 4800 or 38400 baud
(NMEA 0183), and open or terminated (NMEA 2000). An external PC LT-Service Tool is available for optional
configuration and maintenance of the LT-300 GNSS Receiver.
More than 40 years of experience have been put into the design and construction of the advanced LT-300
GNSS Receiver, 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 19.
Step 3: Configuring the Unit see Configuration using LT-Service Tool on page 26 (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-300 User & Installation Manual as guidance for
the best possible and complete installation.

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Quick Installation Guide
LT-300 Global Navigation Satellite System Receiver
Congratulations on your purchase of the LT-300 Global Navigation Satellite System (GNSS) Receiver!
The LT-300 GNSS Receiver is capable of providing accurate positions down to 2 meters. The LT-300 GNSS
Receiver outputs navigation data (up to 10 Hz): UTC time and date, position (latitude and longitude), course
over ground, speed over ground, GNSS satellite information, and magnetic variation.
NOTE: Refer to the 95-100229 LT-300 User & Installation Manual for detailed information on
installation requirements and guidance.
Unpacking
Unpack the LT-300 GNSS Receiver and check that the following items are present:
·LT-300 GNSS Receiver
·LT-300 GNSS Pole & 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
Mounting
Mounting considerations:
·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 in an area with an ambient temperature between -40°C and +55°C (-40°F and +131°F)
·The minimum compass safe distance is 0.3 m. (1 ft.)
IMPORTANT: The pinol screw used for fastening the pole mount shall not exceed 0.8 NM (0.6 lbs/ft).
Refer to the 95-100229 LT-300 User &
Installation Manual for
Safety Instructions.
WARNING
FIGURE 1: LT-300 GNSS RECEIVER WITH POLE
MOUNT INSTALLATION
FIGURE 2: LT-300 GNSS RECEIVER WITH ROOF
MOUNT INSTALLATION

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FIGURE 4: WIRING OF THE LT-300 GNSS RECEIVER TO A SERIAL PORT (RS-
422).
Connecting
The LT-300 GNSS Receiver connector and cable interconnect details are listed in Table 2 and Figure 3.
NMEA 0183 baud rate
The NMEA 0183 baud rate is configured by selecting the input level of the NMEA 0183 Rx signals (RxD+/RxD-),
see Table 3.
NMEA 2000 ‘Open’or ‘Terminated’
The LT-300 GNSS Receiver is configured to ‘Open’(NMEA 2000) from the factory. The LT-Service Tool can be
used for configuration of NMEA 2000 ‘Terminated’.
Configuration
Use the LT-Service Tool for optional configuration of the LT-300 GNSS Receiver. The LT-Service Tool is a PC
program which may run on any Windows PC. The LT-Service Tool is connected to the LT-300 GNSS Receiver
via the NMEA 0183 interface, see Figure 4.
LT-Service Tool Key Features:
LT-300 GNSS Interconnect Details
Pin No. Wire Color Wire Designation
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
TABLE 2: LT-300 GNSS RECEIVER MULTI CABLE WIRE COLOR
AND DESIGNATION.
FIGURE 3: TRANSMIT AND RECEIVE DIRECTIONS FOR THE LT-
300 GNSS RECEIVER.
LT-300 GNSS Baud Rate Configuration
Mode RxD+/RxD- Baud Rate
Option 1 (default) Floating (not connected) 4.800
Option 2 Grounded (connected to GND) 38.400
TABLE 3: CONFIGURATION OF LT-300 GNSS RECEIVER NMEA 0183 BAUD RATE.
·Configuration of GNSS receiver (GPS,
SBAS, GLONASS and BeiDou)
·Configuration of NMEA 2000 ‘Open’or
‘Terminated’
·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

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Installation
Unpacking (in-the-box)
Unpack your LT-300 GNSS Receiver and check that the following items are present:
·LT-300 GNSS Receiver
·LT-300 GNSS Pole & 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-300 GNSS Receiver 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-300 GNSS Receiver
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 unobstructed view to the sky. 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 in an area with an ambient temperature between -40°C and +55°C (-40°F to +131°F)
·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 with a minimum angle of 20 degrees towards a radar antenna (above or below).
·The compass safe distance for standard and steering compasses is 0.3 m (1 ft). Observe this distance
to prevent interference to a magnetic compass.
IMPORTANT: The pinol screw used for fastening the pole mount shall not exceed 0.8 NM (0.6 lbf-ft).

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Water intrusion
It is recommended not to use pneumatic tools for cleaning the LT-300 GNSS Receiver, 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-300 GNSS Receiver, see Figure 5 (roof
mount) and Figure 6 (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 14
NOTE: The LT-300 GNSS Receiver 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 6: LT-300 GNSS RECEIVER WITH POLE MOUNT.
FIGURE 5: LT-300 GNSS RECEIVER WITH ROOF MOUNT.

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Pole Mount installation
Step 1: Unpack the LT-300 GNSS Receiver and make a record of the unit serial number for support or
warranty issues that could occur in the future. The unit serial number label is fixed on the pole mount as
illustrated on Figure 7.
FIGURE 7: POLE MOUNT INSTALLATION STEP 1(MAKE
A RECORD OF THE UNIT
SERIAL NUMBER
)
FIGURE 8: POLE MOUNT INSTALLATION STEP 1(BOTTOM SIDE
OF THE LT-300 GNSS RECEIVER)

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FIGURE 11: POLE MOUNT INSTALLATION STEP 3(LOCATE AN
APPROPRIATE LOCATION)
Step 2: Please refer to NMEA 0183 Baud Rate on page 20 for details on NMEA 0183 baud rate settings and
LED Color Description on page 20 for LED description. Figure 9 is illustrating the bottom side of the LT-300
GNSS Receiver; highlighting the 2-color LED, the locking symbols, and the safety lock hole.
Step 3: Locate an appropriate location for the pole mount installation. See drawings under step 3 with
respect to pole mount installation.
IMPORTANT: Make sure that the LT-300 GNSS Receiver is capable of receiving signals from the GNSS
satellites (see Mounting and installation considerations on page 5 for details) and no compass
within 0.3 m. (1 ft.) of the unit. Mount the LT-300 GNSS Receiver at least 1 m. away from VHF,
UHF, MF-HF, Inmarsat, Iridium, etc. radio transmitting equipment. Make sure that the LT-300
GNSS Receiver minimum has a 20-degree angle towards a radar antenna (above or below).
FIGURE 9: POLE MOUNT INSTALLATION STEP 2(BOTTOM SIDE
OF
LT
-
300
GNSS
R
ECEIVER
)
FIGURE 10: POLE MOUNT INSTALLATION STEP 3(LOCATE
AN APPROPRIATE LOCATION)

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FIGURE 12: POLE MOUNT INSTALLATION STEP 3(LOCATE AN APPROPRIATE LOCATION)

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Step 4: Complete the internal or external cable routing. Feed the communication cable through the pole
mount.
FIGURE 13: POLE MOUNT INSTALLATION STEP 4(INTERNAL ROUTING OF
THE COMMUNICATION CABLE)

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FIGURE 14: POLE MOUNT INSTALLATION STEP 4(EXTERNAL ROUTING
OF THE COMMUNICATION CABLE)

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Step 5: Fasten the pole mount by securing the two screws as illustrated in Figure 15 (pinol and safety lock
screw).
IMPORTANT: The pinol screw used for fastening the pole mount to the 1”tube shall not exceed 0.8 NM
(0.60 lbs/ft). The Safety lock screw used for fastening the pole mount to the LT-300 GNSS Receiver shall not
exceed 0.6 NM (0.44 lbs/ft).
FIGURE 15: POLE MOUNT INSTALLATION STEP 5(SECURING SCREWS)