Affordable 3-axis compass module

A full-featured 3-axis digital compass designed for flexibility and adaptability — the perfect fit for sonobuoys, ADCPs, sidescan sonar, low-cost robotics, and other cost-sensitive applications.

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The highest-performance 3-axis compass module in its price range, PNI's Prime provides pitch, roll and compass heading everywhere, including where GPS is compromised or unavailable — underwater or underground, beneath bridges or inside buildings. The low-power consumption, low-cost Prime provides all-digital compass heading outputs accurate to 1 degree, can be calibrated to account for magnetic distortions, and offers several user programmable parameters including output damping, reporting units, and sampling configuration.

3-axis measurement   3-axis measurement   Integrated Processor   Integrated Processor
Hard- and soft- iron correction   Hard- and soft- iron correction   Low power   Low power consumption


Full featured digital compass...

Combining PNI's low-power consumption magneto-inductive sensors with a 3-axis MEMS accelerometer, Prime is a low-cost compass that provides accurate heading and tilt readings, even at high and low latitudes. PNI's advanced hard and soft iron correction algorithms allow for compensation of magnetic distortions inherent in the user's system, resulting in reliable and consistent readings. a 2 axis price.CompassPoint Prime, enlarged to show detail.

By leveraging PNI's patented magneto-inductive sensors with intelligent power-saving algorithms, Prime consumes less than half the power of magneto-resistive-based compasses. Unlike competetive products, Prime works well at high and low latitudes where the earth's magnetic field has a very high Z-axis component. Prime is the compass of choice for low-cost robots, sonobouys, acoustic Doppler current profilers (ADCPs), sidescan sonar, and seismic monitoring equipment.


Digital Interface
Magnetic Distortion Compensation
  Binary RS232 Hard & Soft Iron Correction
    With Quality of Calibration Score
Low Power Consumption
RoHS Compliant
  18 mA (typical)  
Usable at High Latitudes
Heading Accuracy
  Maximum Dip Angle (functional) of 85° 1° rms


Heading Specifications
  Heading Accuracy @ 45°  tilt 1° rms
  Repeatability 0.05° rms
  Resolution 0.1°
Tilt Specifications
  Tilt Accuracy 1° rms
  Tilt Range Roll: ±180°
Pitch: ±90°
  Tilt Repeatability 0.05° rms
  Tilt Resolution 0.1°
Mechanical Characteristics
  Dimensions (L × W × H) 3.3 × 3.1 × 1.3 cm
  Mounting Options Screw mount / standoff, horizontal or vertical
  Weight 5 grams
I/O Characteristics
  Communication Interface Binary RS232
  Maximum Sample Rate 10 samples/sec
Power Requirements
  Supply Voltage 3.6 - 5 V (unregulated)
  Typical Current Draw @ 10 Hz sample rate 16 mA
  Current Draw, sleep mode  0.6 mA
Environmental Characteristics
  Operating Temperature Range −40 to +85 °C
  Storage Temperature Range −40 to +85 °C