| Patents for G01C 17 - Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes (3,922) |
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| 06/03/1992 | EP0487955A1 Compass |
| 06/03/1992 | EP0329652B1 Device for measurement of a magnetic field which is constant or varies over time |
| 06/03/1992 | CN1061659A 高精度磁罗经 Precision magnetic compass |
| 05/27/1992 | EP0486742A1 Magnetic compass |
| 05/26/1992 | US5117375 Calibration of magnetic compasses |
| 05/20/1992 | EP0485681A1 Appliance for measuring the direction of the terrestrial magnetic field |
| 05/20/1992 | CN2105046U Pointing-to-the-south vehicle |
| 05/19/1992 | US5115238 Calibration apparatus of angular velocity sensor in self-contained navigational system |
| 05/13/1992 | EP0484487A1 Method for measuring the azimuth of a drillhole |
| 05/05/1992 | CA1299859C Apparatus and method for determining azimuth, pitch and roll |
| 05/05/1992 | CA1299857C Method of calibrating a compass heading |
| 04/28/1992 | US5107597 Magnetic compass |
| 04/22/1992 | EP0481644A1 Output signal processing unit of a fluxgate sensor |
| 04/21/1992 | US5105548 Apparatus and method for determining azimuth, pitch and roll |
| 04/21/1992 | CA1299244C Apparatus for determining the strength and direction of a magnetic field, particularly the geomagnetic field |
| 04/02/1992 | DE4125369A1 Navigation system for motor vehicle - uses global positioning system and independent navigation data with correction of azimuth sensor signals |
| 03/17/1992 | US5095631 Magnetic compass |
| 03/17/1992 | US5095630 Electronic magnetic compass |
| 03/05/1992 | DE4128740A1 Electronic compass with direction signal compensation - employs common software in manual and automatic modes using maxima and minima of orthogonal pick=up voltages |
| 03/04/1992 | EP0203179B1 Flux gate sensor |
| 03/03/1992 | CA1296519C Solar compass and time indicator device |
| 02/25/1992 | US5090231 Electronic compass system |
| 02/05/1992 | EP0469967A1 Magnetic transmitter and receiver for determining the position and orientation of a moving body |
| 02/04/1992 | CA1295126C Roll-independent magnetometer system |
| 01/15/1992 | EP0466634A1 Compass and compass apparatus |
| 01/15/1992 | EP0346325B1 Navigation process for vehicles equipped with an electronic compass |
| 01/15/1992 | CN1057901A Photoelectric directional compass and its manufacturing method |
| 01/14/1992 | US5079846 Floating disk compass |
| 01/14/1992 | US5079845 Dual readout analog/digital magnetic compass |
| 12/12/1991 | WO1991011683A3 Navigation aid including map transparency holder |
| 11/28/1991 | WO1991018262A1 Method for measuring the azimuth of a drillhole |
| 11/19/1991 | US5067083 Vehicle driving azimuth detecting apparatus for correcting a disturbed geomagnetic azimuth |
| 11/19/1991 | US5065521 Magnetic field measurement and compass calibration in areas of magnetic disturbance |
| 11/06/1991 | CN1056007A Compass watch of mechanically or electromechanically driver type and bezel specifically intended for such watch |
| 10/31/1991 | WO1991012491A3 Electro optical apparatus |
| 10/29/1991 | US5060390 Navigation aid |
| 10/23/1991 | EP0452757A1 Mechanical or electromechanical compass-watch |
| 10/23/1991 | EP0167544B2 Magnetometer with a time encryption for measuring magnetic fields |
| 10/23/1991 | EP0165258B2 Magnetometer with time coding |
| 10/23/1991 | CN2087330U Optical-fibre magnetic compass |
| 10/17/1991 | WO1991015778A1 A solid state compass |
| 10/16/1991 | EP0451988A1 Heading detecting apparatus |
| 10/16/1991 | EP0451839A2 Direction finding apparatus |
| 10/02/1991 | CN1055056A 指南针 Compass |
| 10/01/1991 | US5052116 Method and apparatus for measuring azimuth |
| 09/25/1991 | EP0448018A1 Compass |
| 09/24/1991 | CA1289621C Frequency difference digital compass and magnetometer |
| 09/11/1991 | EP0363363B1 Electronic compass |
| 09/10/1991 | US5046260 Electronic compass |
| 09/04/1991 | CA2037394A1 Determination of magnetic interference in a borehole |
| 09/03/1991 | US5046031 Method and apparatus for automatic flux-gate compass calibration |
| 09/03/1991 | CA1288241C Slightly magnetic compass |
| 08/10/1991 | WO1991012491A2 Electro optical apparatus |
| 08/09/1991 | CA2009711A1 Electro optical apparatus |
| 08/08/1991 | WO1991011681A1 Electronic compass and other magnetic devices |
| 07/30/1991 | WO1991011683A2 Navigation aid including map transparency holder |
| 07/25/1991 | WO1991010879A1 Position sensor |
| 07/25/1991 | DE4001657A1 Position measurement arrangement measures earth's magnetic field - uses high permeability annular element in toroid carrying stimulation and receiving coils |
| 07/24/1991 | EP0437893A1 Electric compass |
| 07/24/1991 | EP0437545A1 Electronic digital compass |
| 07/23/1991 | CA1286496C Method for performing automatic calibrations in an electronic compass |
| 07/17/1991 | EP0436794A1 Magnetic compass |
| 07/03/1991 | EP0434884A1 Direction indicating device |
| 07/03/1991 | EP0344150B1 Navigation process for vehicles equipped with an electronic compass |
| 06/18/1991 | CA1285042C Apparatus for displaying travel path |
| 06/11/1991 | US5023799 Vehicular traveling direction measuring system |
| 06/04/1991 | US5021962 Navigation method for vehicles with electronic compass |
| 05/30/1991 | WO1991007640A1 Method of navigation and navigation device compensating for magnetic declination |
| 05/30/1991 | WO1991007639A1 Electronic compass with inclination-angle correction |
| 05/16/1991 | DE3937921A1 Navigationsverfahren und -vorrichtung zur kompensation der ortsmissweisung Navigation method and apparatus for compensation of the local declination |
| 05/16/1991 | DE3937160A1 Elektronischer kompass mit neigungswinkelkorrektur Electronic compass with tilt angle correction |
| 05/08/1991 | EP0426091A1 Direction finding apparatus |
| 04/30/1991 | US5010653 Apparatus and method for determining azimuth, pitch and roll |
| 04/18/1991 | WO1991005221A1 Remote-reading magnetic compass |
| 03/06/1991 | EP0414982A1 Solar compass and time indicator device |
| 02/26/1991 | US4995165 Roll-independent magneto meter system |
| 02/07/1991 | DE3925378A1 Navigation method for vehicle with electronic compasses - matching parameters of elliptical locus to earths magnetic field horizontal vector |
| 02/05/1991 | US4989333 Navigation method for vehicles with electronic compass |
| 01/24/1991 | DE3923531A1 Electronic compass with electro-optical display - shows vehicle direction w.r.t. magnetic north and additionally shows adjustable desired direction |
| 12/27/1990 | EP0403926A1 Ski boot |
| 12/18/1990 | US4977679 Azimuth signal generator |
| 11/27/1990 | US4972593 Method and apparatus for measuring the undistorted magnetic field of the earth |
| 11/20/1990 | US4972146 Saturble core device with DC component elimination for measuring an external magnetic field |
| 11/20/1990 | US4970793 Method and apparatus for determining the position of stars |
| 11/15/1990 | DE3915404A1 Geological compass measuring impacts and falls of tectonic elements - has magnetic compass in form of sphere following free play of forces of gravitation and magnetic fields of earth |
| 11/08/1990 | CA2002091A1 Floating disk compass |
| 10/17/1990 | EP0392448A1 Procedure for the determination of the angular error of a magnetic field sensor |
| 10/10/1990 | EP0391647A2 Calibration apparatus of angular velocity sensor in self-contained navigational system |
| 09/18/1990 | US4958072 Remote fiber optic angular-orientation sensor using phase detection of two orthogonal oscillating polarization vectors |
| 09/18/1990 | US4956920 Device for determining true bearing during daytime |
| 09/06/1990 | DE3907328A1 Solar compass |
| 09/04/1990 | US4953305 Vehicle compass with automatic continuous calibration |
| 09/04/1990 | US4953304 Mask compass |
| 08/16/1990 | EP0382290A1 Method and apparatus for automatic flux-gate compass calibration |
| 08/16/1990 | DE4003563A1 Direction of travel measurer for vehicle - uses geomagnetic sensor, vehicle magnetisation state decision device with simple measurement value circle correction |
| 08/16/1990 | DE3903439A1 Arrangement for neutralising magnetic-field distortion |
| 08/06/1990 | CA2009171A1 Method and apparatus for automatic flux-gate compass calibration |
| 07/12/1990 | DE4000345A1 Measuring orientation of moving object, esp. vehicle - using geomagnetic directional sensor to measure horizontal components of earths magnetic field, and compsn. for magnetisation changes |
| 07/03/1990 | US4937945 Magnetic compass with optical encoder |
| 06/26/1990 | CA1270635A1 Magnetic compass calibration |