2525 Brunswick Ave, Suite 205
Linden,  NJ  07036,  USA
Tel:   908-474-9595
Fax: 908-474-9090

Compasses, Solid State Inclinometers, Directional Probes, Electrolytic Tilt Sensors


vertical version


Low cost VERTICAL SOLID STATE advanced Pitch / Roll / Temperature compensated COMPASS / MAGNETOMETER system is built around a state of the art CMOS microcontroller utilizing AOSI’s proprietary algorithm on a 0.9″DIAM x2″ assembled PCB and sealed in a 1″ diameter x5″ long tubular enclosure with integrated bulkhead connector.

The COMPASS PROBE outputs continuous heading, magnetic field, dual axis tilt and temperature data over the standard RS-232 and RS-422 and  RS-485* or USB interfaces.

The AZIMUTH is generated from a 3 axis semiconductor magnetometer with 12 bit ( 0.08 deg ) resolution.

The LINEAR tilt information is available with 12 bit resolution for 180 arcdeg.

COMPASS/TILT probe is perfectly suitable for logging, bore hole profiling, antenna orientation, numerous navigation, research, training, construction, entertainment and other precision orientation, navigation and leveling applications.

The COMPASS PROBE is able to output multi-sensor information in NMEA-0183 mode and responds to numerous generally used commands.

Easy link through the Hyper Terminal Windows accessory facilitates custom calibration, hard iron compensation, data acquisition, data averaging, scan delay, dumping factor and data display.

Compass probe can be supplied in a EZ-PROBE-4VL logging version.

Compass Probe is supplied with a mating 6 foot cable, demo software and manual. Manual can be downloaded from the LIBRARY section.




Azimuth Range 0–360 deg, continuous
Azimuth Resolution 12 (0.08) bit (deg)
Azimuth Repeatability < 0.25 deg, typical vertical
Azimuth Accuracy < 1.0 deg, typical vertical, fully calibrated, not tilted.
Magnetic Field +-2 Gauss typical
Magnetic Resolution < 1 mGauss typical
Pitch Range +90 to -90 arcdeg linear after correction
Roll Range +180 to -180 arcdeg linear after correction
Weight 200 gramms nominal
Dynamic Range 10 reading/sec
Tilt Resolution 12 bit full scale, both axis
Tilt Repeatability <2 bits
Temperature -40 to +85 deg C
Communication 1200–114K baud,8,N,1,N RS-232 and RS-422 standards
Supply 6—15 Vdc
Size 1.0″: diam x 5″L sealed probe
NMEA-0183 mode 6 select modes 1999 Revision


*  RS-485 is activated upon special request
SOFT NORTH: North direction could be manually reset by software to compensate for local declination angle
CABLE: Custom size cables are available upon request. Unit should be locally calibrated.
Specifications of sensors may change without notice.


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