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Making Safe TRAX





Press Release

Heading Sensors

Willow Technologies Limited introduces the new MEMS based, FieldForce Trax AHRS module from PNI. Designed for life saving robotics, where unmanned vehicles need to perform progressively more complex tasks, requiring increasingly robust and accurate heading and orientation information.

The new FieldForce Trax AHRS module provides unparalleled heading accuracy when static, while moving and when encountering magnetic distortion. Trax employs a filtering algorithm that intelligently fuses Reference Magnetic Sensors with gyros and accelerometers, to overcome errors due to erratic motion and changes in the local magnetic field.

Said Martin Pearce, Marketing Director of Willow Technologies ‘Many AHRS modules in the market leave too much room for error and lose heading when encountering magnetic distortion, they suffer from errors when experiencing erratic motion and often, even in a static environment don’t provide accurate heading.’

This small device measures 3.5 × 4.3 × 1.0 cm and weighs just 9g. With a 360º heading range, the static accuracy is 0.3º rms and in the presence of magnetic transient and / or dynamic motions 2º rms. Tilt range is ±90 of pitch; ±180 of roll, with resolution at 0.1º and repeatability being 0.05ºrms. Its maximum dip angle is 70º.

‘The affordable Trax is priced for commercial use, delivering more reliable heading than AHRS modules that cost twice as much.’ Continued Pearce.

Utilising RS232 & USB communication interfaces, Supply voltage (unregulated) is 3.6 – 5 VDC, current draw (continuous output) 60mA with operating and storage temperatures both at -40 to +85ºC.

‘Trax is the first AHRS that stays ‘on track’ even through magnetic fields’. Concluded Pearce.

Editor Information


Willow Technologies Limited, founded in 1989, provides solutions to customers by designing, manufacturing and supplying components and systems to the electrical and electronic marketplace across the globe. Specialists in switching, sensing, resistive and hermetic seal solutions, the company has a wide portfolio of technologies and over 100 years of application experience. With an in-house engineering capability and a production facility for rapid prototyping of custom parts, the company is well equipped to develop products matching customer specific application requirements. Willow is ISO9001: 2008 Registered.

For further information please contact:

Martin Pearce, This e-mail address is being protected from spambots. You need JavaScript enabled to view it ,+44 (0) 1342 717102.

Willow Technologies Ltd. Unit 3 Borers Yard, Borers Arms Road, Copthorne, West Sussex, RH10 3LH, UK

Tel: +44 (0) 1342 717102, Fax: +44 (0) 1342 717014, Email:

CORPORATE: Solid State Group

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