Strapdown Heading Reference SHR-S360 (Gyro-Stabilized)

A gyro-stabilized heading reference includes a gyro on the yaw axis of the sensor package. This allows the reference sensor to provide accurate heading data, even while the platform is moving.


  • Solid State, Strapdown System
  • Small Size
  • Low Cost, Low Power
  • Rugged, High Reliability
  • Vibration Resistant
  • Analog and RS-232 Serial Outputs
  • PC Heading Calibration
  • One Year Limited Warranty
  • Engineering Support

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The SHR-S360 is the smallest version of our Strapdown Heading Reference line of sensors. This product uses MEMS gyros to make the SHR-S360 more economical and slightly smaller than the SHR-E360 heading reference that uses VSG gyros for enhanced accuracy and signal stability.

The SHR-S360 provides heading and sensor information. It includes a high accuracy triaxial fluxgate magnetometer, a triaxial accelerometer, and a rate gyro. This unit is a “strap-down” or “body-axis” sensor. The sensitive axes of the SHR will stay at a constant relationship with the vehicle and move as the vehicle moves. Since the fluxgate sensors rotate with the unit, it must use its angle sensors to calculate the rotation back to level. This function is similar to a mechanical gimbal except that the rotations are done using software. The SHR-S360 has several advantages over using a traditional gimbal including: no bearings to wear out, no fluid to leak and high shock survivability.

The SHR-S360 is gyro-stabilized. This means that the SHR will provide better performance in dynamic applications. The internal gyro allows the SHR to respond to short-term movements while the fluxgate provides the long-term heading reference. This combination of sensors allows for accurate data in a wider range of applications than a SHR without gyro-stabilization.

The Watson Industries “strap-down” solution provides a better magnetic heading than other magnetic heading products using mechanical gimbals. A significant problem with mechanically gimbaled compasses becomes apparent when trying to calibrate the heading sensor in the field. With a strap-down system, the magnetometers are fixed with respect to the vehicle in which it is mounted; Therefore, the constant soft and hard iron field distortions can be fully calibrated out.

The SHR-S360 provides superior performance in installations involving land vehicles.



Range: Bank ±180°
Range: Elevation ±90°
Resolution: 0.02° Binary mode (14 bit)
Analog Scale Factor: 18°/V ±10V Bank
±5V Elevation
Accuracy: Static ±0.5°

Magnetic Heading

Range: 0° – 360°
Resolution: 0.02° Binary mode (14 bit)
Analog Scale Factor: 18°/V ±10V Output
Accuracy: Static ±1.5°
* Accuracy: Dynamic 2%

Angular Rate

Range: Yaw ±100°/sec
Resolution: 0.025°/sec Binary mode (14 bit)
Scale Factor Accuracy: 2%
Bias: Yaw < 0.3°/sec
Non-Linearity: < 0.05% Full scale range
Bandwidth: 20 Hz


Range: X, Y, Z ±10g
Resolution: 4mg
Scale Factor Accuracy: 1%
Bias: X, Y, Z < 10mg
Non-Linearity: 0.1% Full scale range
Bandwidth: 3 Hz


Range: X, Y, Z ±1000 mGauss
Resolution: 0.1 mGauss Binary mode (14 bit)
Scale Factor Accuracy: 1%
Bias: X, Y, Z < 5 mGauss
Non-Linearity: < 0.01% Full scale range
Bandwidth: 10 Hz


Temperature: Operating -40°C to 85°C
Temperature: Storage -55°C to 85°C
Vibration: Operating 2.5g rms 20 Hz to 2 KHz
Vibration: Survival 10g rms 20 Hz to 2 KHz
Shock: Survival 500g 10mS ½ sine wave


Frame Rate: 284.44 Hz Maximum
Startup Time: Data 5 sec
Startup Time: Fully operational 10 sec
Input Power: 10 to 35VDC 2.3W
Input Current: 150mA @ 12VDC 85mA @ 24VDC
Digital Output: RS-232
Analog Output: ±10VDC
Analog Output Impedance: 300 Ohm Per line


Axis Alignment: < 0.25°
Size: Including Mounting Flanges 3.24″W x 5.78″L x 2.38″H 8.2 x 14.7 x 6.0 (cm)
Weight: 19.4 oz (1.2 lb) 550 grams (0.6 Kg)
Connection: RS-232 9 pin female “D” subminiature
Connection: Power / Analog Outputs 9 pin male “D” subminiature
* Actual accuracy can be calculated as the listed percentage multiplied by the change in value over the entire dynamic maneuver.
Static heading accuracy is dependent on the magnetic environment.
This sensor will meet or exceed this spec within the 48 contiguous United States.
Specifications are subject to change without notice.
This product may be subject to export restrictions. Export Classification ECCN 7A994.



Title File Type
SHR-S360 Spec Sheet pdf Download
SHR-S360 Owner’s Manual pdf Download