Electronis Compass (LT-500 AHRS)
Electronis Compass (LT-500 AHRS)

Electronis Compass (LT-500 AHRS)


The LT-500 Attitude Heading Reference System (AHRS) unit is a maritime navigation electronic compass / heading sensor from Lars Thrane A/S. The LT-500 AHRS unit is designed for the leisure as well as the professional maritime markets. The LT-500 unit meets all standards and certification requirements needed for worldwide maritime navigation equipment.


The LT-500 AHRS unit is a small, compact, and very advanced unit with 11 precision sensors. With the use of sensor-fusion and Kalman filtering, the LT-500 AHRS unit outputs: true heading1, roll, pitch, air pressure, and temperature real-time, with high precision and resolution. The LT-500 AHRS unit 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.

The LT-500 AHRS unit is designed and built for the demanding and rough environment at sea and with an operational temperature range from -25⁰C to +55⁰C (-13⁰F to +131⁰F).


The LT-500 AHRS unit is easy to mount and supports NMEA 0183, NMEA 2000, and power on a single cable. Without compromising the high performance, the LT-500 AHRS unit may be installed in any position. The LT-500 AHRS units has a built-in user interface (display and control buttons) for installation and service. Navigation output from the LT-500 AHRS unit is available in the user interface. The LT-500 AHRS unit supports automatic levelling (pitch and roll), which can be used during the installation. The built-in magnetometer calibration algorithm will compensate for deviation, and the LT-500 AHRS unit will output reliable navigation data. The external PC installation and service software is available for optional configuration and maintenance of the LT-500 AHRS unit.

More than 40 years of experience have been put into the design and construction of the advanced LT-500 AHRS unit, with an exceptional performance and specification level.

LT 500 AHRS Heading Sensor
LT 500 AHRS Heading Sensor

Key Features :

  • Attitude Heading Reference System with 11 precision sensors.
  • True heading, magnetic heading, deviation, variation, roll, pitch, air pressure, and temperature.
  • Display and control buttons for installation and service.
  • Simultaneously NMEA 0183 and NMEA 2000 data.
  • Configurable NMEA 0183 sentences (enable/disable, talker ID, output rate).
  • Easy configurable NMEA 2000 termination resistor (open or terminated).
  • Easy configurable NMEA 0183 data rate (4800 or 38400 baud).
  • Mount in any orientation without compromising the high performance.
  • Each unit is factory calibrated and functional tested over temperature prior to shipment.
  • Worldwide maritime certification.

    LT 500 AHRS Heading Sensor
    LT 500 AHRS Heading Sensor

Specifications :

  • Certification & standards: CE, IEC 60945, IEC 60950, FCC, IC, RCM, RoHS, NMEA 0183, NMEA 2000.
  • Dimensions: 91.6 x 75.3 x 32.7 mm (3.61 x 2.96 x 1.29 in).
  • Weight: 104 g (0.23 lbs).
  • Temperature (ambient), operational: -25°C to +55°C (-13°F to +131°F).
  • Temperature (ambient), storage: -30°C to +80°C (-22°F to +176°F).
  • Waterproof: IP42 / Humidity: 95% non-condensing @ 40°C.
  • Communication Interface: 8-pin female connector for NMEA 0183, NMEA 2000 and power.
  • Input power: 9-40 VDC.
  • Power consumption: < 1W.
  • Load Equivalent Number (LEN) : 2.
  • Compass safe distance: 0.3 m (1 ft).

In the Box :

  • LT-500 AHRS.
  • 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.
    LT 500 AHRS Heading Sensor
    LT 500 AHRS Heading Sensor

    LT 500 Dimensions
    LT 500 Dimensions

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