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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
  • Hard- and Soft-Iron Correction
  • 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- and Soft-Iron Correction
With Quality of Calibration Score
Low Power Consumption RoHS Compliant
18 mA (typical) Yes
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 to 5.0 VDC (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