| Patents for G01C 17 - Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes (3,922) |
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| 06/20/1990 | EP0373317A2 Device and method for determining errors in the data of a magnetic direction sensor |
| 06/05/1990 | US4930224 Magnetic compass |
| 05/29/1990 | US4929943 Marine compass rate-of-turn indicator |
| 05/29/1990 | CA1269526A1 Magnetic compass |
| 05/16/1990 | EP0368457A1 Compass system |
| 05/08/1990 | US4924233 Sensor input/output system with continuous compass interface |
| 05/01/1990 | US4920656 Compass assembly with dial biasing disk |
| 04/24/1990 | US4918824 Electronic digital compass |
| 04/19/1990 | WO1990004151A1 Process for determining interference from consumers in navigation systems |
| 04/19/1990 | WO1990004150A1 Electronic digital compass |
| 04/18/1990 | EP0363363A1 Electronic compass. |
| 04/17/1990 | US4916821 Electronic compass and other magnetic devices |
| 04/12/1990 | DE3833798A1 Verfahren zur ermittlung des stoereinflusses von verbrauchern auf navigationssysteme Method for determination of the disturbing influence of con- sumers on navigation systems |
| 03/13/1990 | US4907346 Terrestrial magnetic sensor |
| 03/13/1990 | CA1266715A1 Land vehicle navigation device comprising a filter unit for determining an optimum heading from presented orientation signals, and filter unit to be used in said navigation device |
| 03/07/1990 | EP0357206A2 Sensor input/output system with continuous compass interface |
| 03/06/1990 | US4907007 Mount and magnetic field probe for navigating a motor vehicle |
| 03/06/1990 | US4905377 Traveler's direction finder |
| 02/28/1990 | EP0254712B1 Process for ascertaining the direction of movement of a vehicle by means of an electronic compass |
| 02/27/1990 | CA1266173A1 Simplified calibration technique and auto ranging circuit for an electronic compass control circuit |
| 02/27/1990 | CA1266172A1 Multiplexing of a bandpass filter circuit to work with a flux-gate sensor output |
| 02/27/1990 | CA1266171A1 Microcomputer controlled quick ranging technique and digital filter |
| 02/13/1990 | US4899453 Compass with LED illumination |
| 02/13/1990 | US4899451 Solar compass and time indicator device |
| 01/24/1990 | EP0351469A1 An astronomical north finding system |
| 01/23/1990 | US4894922 Hand bearing compass |
| 01/10/1990 | EP0350001A2 North direction indicator |
| 01/03/1990 | EP0349158A1 Marine compass rate-of-turn indicator |
| 01/03/1990 | CN2050589U Mecca orientation device for pilgrimage |
| 12/26/1989 | US4890105 Step data processor for 180X and 90X compass synchro data |
| 12/20/1989 | EP0346325A1 Navigation process for vehicles equipped with an electronic compass. |
| 12/19/1989 | US4887358 Electronic compass |
| 12/12/1989 | US4887081 Apparatus for displaying travel path |
| 12/06/1989 | EP0344150A1 Navigation process for vehicles equipped with an electronic compass. |
| 12/05/1989 | CA1263704A1 Method and apparatus for automatic calibration of magnetic compass |
| 11/14/1989 | US4881080 Apparatus for and a method of determining compass headings |
| 11/08/1989 | EP0340219A1 Navigation process for vehicles equipped with an electronic compass |
| 10/17/1989 | US4874937 Digital sun sensor |
| 10/04/1989 | CN2045478U Spheric compass |
| 09/26/1989 | US4870602 Method for determining route angles |
| 09/12/1989 | US4866627 Direction finder |
| 09/06/1989 | EP0331262A2 Method of calibrating a compass heading |
| 09/06/1989 | EP0331261A1 Apparatus and method for determining azimuth, pitch and roll |
| 09/06/1989 | CN2044063U 电子方向指示仪 Electronic direction indicator |
| 09/05/1989 | US4862594 Magnetic compass system for a vehicle |
| 08/30/1989 | EP0329652A1 Device for measurement of a magnetic field which is constant or varies over time. |
| 08/29/1989 | US4862398 Correcting method and correcting errors in a terrestrial magnetism heading sensor |
| 08/09/1989 | EP0126089B1 Tactical dinghy compass |
| 07/25/1989 | US4852012 Direction finder for vehicle |
| 07/25/1989 | US4851775 Digital compass and magnetometer having a sensor coil wound on a high permeability isotropic core |
| 07/18/1989 | US4849696 Apparatus for determinig the strength and direction of a magnetic field, particularly the geomagnetic field |
| 07/18/1989 | US4848002 Self-centering needle-less magnetic compass |
| 07/12/1989 | CN2041029U Marine magnetic compass rose |
| 07/04/1989 | US4843865 Method of calibrating a compass heading |
| 06/21/1989 | EP0321123A1 Navigation compass calibration |
| 06/20/1989 | US4841449 Direction finder |
| 06/20/1989 | CA1256208A1 High resolution digital inclinometer |
| 06/06/1989 | US4835875 Cylindrical sundial with installation indicia |
| 05/16/1989 | US4831563 Method of processing output data from geomagnetic sensor |
| 03/28/1989 | CA1251634A1 Magnetic single shot inclinometer |
| 03/22/1989 | EP0308087A2 Step data processor for 180X and 90X compass synchro data |
| 03/08/1989 | CN2033893U Lighted magnetic compass |
| 02/28/1989 | US4807462 Method for performing automatic calibrations in an electronic compass |
| 02/23/1989 | EP0276249A4 Method and apparatus for automatic calibration of magnetic compass. |
| 02/15/1989 | CN2032705U Compass with liquid for navigation |
| 02/09/1989 | DE3725327A1 Magnetic compass |
| 02/08/1989 | EP0186666B1 Process for determining the direction of travel of a vehicle, using an electronic compass |
| 01/24/1989 | CA1249124A1 Flux-gate sensor electrical drive method and circuit |
| 01/18/1989 | CN2031086U 电子罗盘 Electronic compass |
| 01/12/1989 | WO1989000297A1 Frequency difference digital compass and magnetometer |
| 01/10/1989 | US4797841 Method and apparatus for automatic calibration of magnetic compass |
| 01/10/1989 | US4796365 Underwater compass sensor with compass dither |
| 12/20/1988 | US4791730 Direction sensing device |
| 12/20/1988 | US4791729 Electronic compass and method |
| 12/13/1988 | US4791574 Land vehicle navigation device comprising a filter unit for determining an optimum heading from presented orientation signals, and filter unit to be used in said navigation device |
| 11/17/1988 | EP0290811A2 Device for measuring the magnitude and direction of a magnetic field, especially of the earth-magnetic field |
| 11/15/1988 | CA1244885A1 Flux gate sensor |
| 11/01/1988 | US4782453 Method of determining the location of a navigational magnetic field sensor in a vehicle |
| 10/20/1988 | WO1988008139A1 A roll-independent magnetometer system |
| 10/12/1988 | CN88102492A Stroke-displaying instrument |
| 10/04/1988 | US4774766 Weakly magnetic compass |
| 09/20/1988 | US4771547 Correction apparatus for an azimuth calculating system |
| 09/07/1988 | EP0167544B1 Magnetometer with a time encryption for measuring magnetic fields |
| 09/07/1988 | EP0166737B1 Process for determining the interference fields in vehicles having an electronic compass |
| 08/31/1988 | EP0280546A2 Hand bearing compass |
| 08/30/1988 | US4768153 Automatic pilot system |
| 08/30/1988 | US4767988 Precision magnetometer orientation device |
| 08/25/1988 | WO1988006274A1 Electronic compass |
| 08/16/1988 | US4763419 Optical viewing system |
| 08/09/1988 | US4763072 Magnetic azimuth detector |
| 08/03/1988 | EP0276249A1 Method and apparatus for automatic calibration of magnetic compass |
| 08/02/1988 | CA1239990A1 Magnetic flux detector correction system |
| 07/14/1988 | WO1988005155A1 Navigation process for vehicles equipped with an electronic compass |
| 07/14/1988 | WO1988005154A1 Navigation process for vehicles equipped with an electronic compass |
| 07/14/1988 | WO1988005153A1 Navigation process for vehicles equipped with an electronic compass |
| 07/14/1988 | DE3644682A1 Navigationsverfahren fuer fahrzeuge mit elektronischem kompass The navigation method for vehicles with electronic compass |
| 06/22/1988 | EP0272078A2 Apparatus for display travel path |
| 06/21/1988 | US4751783 Azimuth determination apparatus |
| 06/14/1988 | US4750349 Microcomputer controlled quick ranging technique and digital filter |
| 06/08/1988 | EP0165258B1 Magnetometer with time coding |