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


Tilt Compensated Compass / Linear Dual Axis Tilt System
sq_compass-4.jpgLow cost 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 x 2″ for versions 4L and 4VL, and 0.9″ DIAM x 6″ for the version 3AVL assembled PCBs to fit 1″ tubular probes.

The LOGGING COMPASS permits users standalone data collection of up to 20000 data samples without the use of any additional loggers or any other equipment. The user can pre-select required data string and set the compass into the logging mode.

Upon next power-up the logging compass after predetermined delay will initiate automatic data collection at accurate logging intervals. At the end of logging, data can be easily moved into a delimited text file for future analysis.

Example: with 10 sec read intervals and 4 selected variables the compass will perform logging for about 11 hours. Logging compasses are available in vertical or horizontal configurations. Compasses are also available in PROBE vertical and horizontal configurations, as well as DIVE versions.

Units output continuous heading, magnetic field, dual axis tilt and temperature data over the standard USB*, RS-232.RS-422 and  RS-485* 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 over +-90arcdeg. COMPASS/TILT module 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 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.




Azimuth Range 0–360 deg, continuous
Azimuth Resolution 12 (0.08) bit (deg)
Azimuth Repeatability < 0.25 deg, typical vertical
Azimuth Accuracy < 1.00 ( calibrated ) deg, typical vertical, not tilted
Magnetic Field +-2 Gauss typical
Magnetic Resolution < 1 mGauss typical
Pitch Range +90 to -90 arcdeg after linear correction
Roll Range +180 to -180 arcdeg after linear correction
Weight less then 20 gr
Dynamic Range 10 reading/sec
Tilt Resolution 12 bit full scale, both axis
Tilt Repeatability <2 bits
Temperature -40 to +85 deg C
Communication 1200–115200 baud,8,N,1 RS-232 and RS-422 standards
Supply 6—15 Vdc
Size VER 4 ( VER 3A ) 0.9: diam x 2″L ( 0.9″ x 6″ ) PCB Board
NMEA-0183 mode 5 select modes 1999 Revision
Logging capacity 20,000 readings including time stamp
Startup logging delay >= 5 seconds (minimum)
Sample logging rate >= 5 every 5 seconds or longer
Logging duration >= 60 60 seconds or longer



*  USB available on ver-4, RS-485 is activated upon special request
SOFT NORTH: North direction could be manually reset by software to compensate for local declination angle
CABLE: Special cable for PC interfacing is available. Unit should be locally calibrated.


Specifications of sensors may change without notice.