• Attitude Heading Reference System with 11 precision sensors.

• True heading, magnetic heading, deviation, variation, roll, pitch, air pressure, and temperature.

• Display and buttons for installation and service.

• Simultaneous NMEA 0183 and NMEA 2000 data.

• Configurable NMEA 0183 (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).

• Easy 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.


The LT-500 Attitude Heading Reference System (AHRS) unit is a maritime navigation product from Lars Thrane A/S. The LT-500AHRS 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, magnetic heading, deviation, variation1, 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 & sensor fusion

• Calculation of magnetic variation based on the World Magnetic Model (WMM)

• Compensation for 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).

Installation and Navigation

The LT-500 AHRS is easy to mount with a single cable supporting NMEA 0183, NMEA 2000, and power. Without compromising the high performance, the LT-500 AHRS may be installed in any orientation. The LT-500 AHRS has a built-in user interface (display and buttons) for installation and service. Navigation output from the LT-500 AHRS is available in the user interface. The LT-500 AHRS supports automatic levelling (pitch and roll), used during the installation. To compensate for deviation the LT-500 AHRS must perform a figure 8-pattern calibration. Use the LT-Service Tool for optional configuration of the LT-500 AHRS. The LT-Service Tool is a PC program, which may run on any Windows PC.

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


Certification and standards: CE, IEC 60945, IEC 60950, FCC, IC, RCM, RoHS, NMEA 0183, NMEA 2000

Equipment class: Protected, according to IEC 60945

Weight: 104 g (0.23 lbs)

Dimensions: 91.6 x 75.3 x 32.7 mm (3.61 x 2.96 x 1.29 in)

Temperature, operational: (ambient) -25°C to +55°C (-13°F to +131°F)

Temperature, storage: (ambient) -30°C to +80°C (-22°F to +176°F)

Vibration, operational: IEC 60945 (sine) & Proprietary Maritime Random profile (240 h)

Vibration, survival: Properitary Maritime Random profile (100 h)

Vibration, shock: Proprietary Maritime profile (60 g pk, 11 ms)

Waterproof rating: IP42

Humidity: 95% non-condensing @ 40°C

Communication interface: 8-pin female connector for NMEA 0183, NMEA 2000 and power

Input voltage: 9-40 VDC

Power consumption: < 1 W

Load Equivalent Number: (LEN) 2 (NMEA 2000)

Compass safe distance: standard 0.3 m (1 ft)

Compass safe distance: steering 0.3 m (1 ft)

Warranty: 2 year

Maintenance: None

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  • $1,380.00

  • Ex Tax: $1,200.00

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