| Patents for G01C 17 - Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes (3,922) |
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| 05/31/1988 | US4748408 Method and apparatus for providing direction-indicative output signals to the integrating amplifier of a device for detecting magnetic direction |
| 05/25/1988 | EP0268278A2 A correcting method for correcting errors in a terrestrial magnetism heading sensor |
| 05/19/1988 | WO1988003654A1 Device for measurement of a magnetic field which is constant or varies over time |
| 05/10/1988 | US4743913 Hybrid navigation system for determining a relative position and direction of a vehicle and method therefor |
| 04/26/1988 | US4739560 Azimuth sensor which corrects azimuth circle diameter and center for temperature variation |
| 04/19/1988 | US4739263 Magnetic sensor using the earth's magnetism |
| 04/19/1988 | US4738031 Method for establishing the driving direction of a vehicle with an electronic compass |
| 03/30/1988 | CN87201516U Correcting system for orientation sense |
| 03/24/1988 | DE3631513A1 Sun compass |
| 03/22/1988 | US4733181 Single-winding magnetometer with Schmitt trigger output circuit |
| 03/22/1988 | US4733179 Method of determining an interference-magnetic field in a motor vehicle provided with an electronic compass |
| 03/08/1988 | US4729172 Process for establishing the driving direction of a vehicle with an electronic compass |
| 03/01/1988 | US4728888 Magnetometer with time coded output of measured magnetic fields |
| 02/17/1988 | CN87204396U Cross-country orientation device |
| 02/16/1988 | US4725957 Process for correcting angle errors in an electronic compass in vehicles |
| 02/03/1988 | EP0254712A1 Process for ascertaining the direction of movement of a vehicle by means of an electronic compass. |
| 01/27/1988 | EP0254613A1 Core for a magnetic compass |
| 01/26/1988 | US4720992 Calibration sequence and method for an electronic compass |
| 01/14/1988 | WO1988000330A1 Method and apparatus for automatic calibration of magnetic compass |
| 01/05/1988 | US4716655 Ornamental compass |
| 12/23/1987 | CN86205242U Direction-indicating dividing disc for level instrument |
| 11/25/1987 | EP0246781A2 Magnetic field direction indicating devices |
| 11/19/1987 | EP0246138A1 Weakly magnetic compass |
| 11/17/1987 | US4706389 Attitude displacement measurement apparatus |
| 11/11/1987 | CN86205724U Hq-1 engineering compass |
| 11/05/1987 | DE3614766A1 Electromechanical compass |
| 10/20/1987 | US4700490 Compass |
| 10/14/1987 | EP0240782A1 Mounting of a magnetic field sensor on a motor vehicle for navigational purposes |
| 10/13/1987 | US4698912 Magnetic compass calibration |
| 09/23/1987 | EP0237806A1 Process and system for the compensation of magnetic-interference fields in a vehicle |
| 09/22/1987 | US4694583 Electronic automotive compass and display |
| 09/16/1987 | CN86209574U Compass photographing device |
| 08/18/1987 | US4686772 Electronic magnetic compass system |
| 08/05/1987 | EP0230509A2 The multiplexing of a bandpass filter circuit to work with a flux-gate sensor output for an electronic compass |
| 07/22/1987 | EP0229468A2 Magnetic flux detector correction system |
| 07/21/1987 | US4680866 Magnetic flux detector correction system |
| 07/08/1987 | EP0227889A2 Simplified calibration technique and circuit for an electronic compass |
| 07/08/1987 | EP0227888A2 Microcomputer-controlled quick calibration technique for an electronic compass |
| 07/07/1987 | US4677754 Multiplexing of a bandpass filter circuit to work with a flux-gate sensor output |
| 07/01/1987 | EP0227544A2 Magnetic compass |
| 07/01/1987 | EP0226653A1 Method to determine heading by using and automatically calibrating a 3-axis magnetometer rigidly fitted in an aircraft |
| 06/30/1987 | US4677381 Flux-gate sensor electrical drive method and circuit |
| 06/23/1987 | US4675607 Magnetic field probe with improved positioning of a winding and core plate thereof relative to a housing of the probe |
| 06/17/1987 | CN86206170U Multi-functional meter for recording step, distance, temp. and manual |
| 06/16/1987 | US4673913 Zigzag running warning system for automotive vehicles |
| 06/16/1987 | US4673878 Vehicle location display device with averaging means for correcting location information |
| 06/16/1987 | EP0225493A2 Magnetic compass calibration |
| 06/09/1987 | US4672565 Direction detecting system for vehicles |
| 06/09/1987 | US4671120 Combined heading and depth sensor |
| 06/09/1987 | US4670988 Compass mechanism used in combination with handle or like element on the interior of an automobile type vehicle |
| 06/03/1987 | EP0223782A1 High resolution digital inclinometer |
| 06/03/1987 | CN85108741A Compass with movable supporting axle |
| 06/02/1987 | CA1222565A1 Compasses |
| 05/26/1987 | US4668100 Electronic equipment with geomagnetic direction sensor |
| 05/26/1987 | US4667414 Direction-finding devices |
| 05/13/1987 | EP0221436A1 Magnetic-field sensor |
| 04/23/1987 | DE3537363A1 Compass |
| 04/21/1987 | US4660161 Correction method for vehicle-mounted geomagnetic field sensors |
| 04/15/1987 | EP0218273A1 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 |
| 04/14/1987 | US4656751 Magnetic compass |
| 04/14/1987 | US4656750 Heading sensor |
| 04/07/1987 | CA1220279A1 Precision magnetometer orientation device |
| 03/18/1987 | EP0214817A2 Calibration of magnetic compasses |
| 03/05/1987 | DE3530858A1 Probe arrangement for transmitting course information from a magnetic compass, which is not gimbled, to a remote compass system, a self-controlling system or a similar system |
| 02/25/1987 | EP0073781B1 Portable information device |
| 02/24/1987 | US4646015 Flux gate sensor with improved sense winding gating |
| 02/03/1987 | US4640016 Means for indicating direction and a method of determining a direction |
| 01/29/1987 | DE3537346A1 Miniature compass with clip apparatus |
| 01/20/1987 | US4637480 Azimuth measuring method for non-vertical drilling |
| 01/13/1987 | US4635371 Device to indicate solar exposure |
| 01/06/1987 | US4634978 Magnetometer direction measuring system requiring no external compass |
| 12/04/1986 | WO1986007139A1 High resolution digital inclinometer |
| 11/18/1986 | US4622843 Simplified calibration technique and auto ranging circuit for an electronic compass control circuit |
| 11/18/1986 | US4622754 Automotive drive guide system with error monitor for a magnetic compass therein |
| 11/18/1986 | US4622750 Universal measuring gauge for geological structures |
| 10/14/1986 | US4616424 Magnetic direction sensor |
| 10/14/1986 | US4616423 Tactical dinghy compass |
| 09/30/1986 | US4614041 Magnetic angular position sensor |
| 09/25/1986 | WO1986005584A1 Process for ascertaining the direction of movement of a vehicle by means of an electronic compass |
| 09/09/1986 | US4611293 Method and apparatus for automatic calibration of magnetic compass |
| 08/19/1986 | US4606133 High resolution digital inclinometer |
| 07/23/1986 | EP0187761A1 Process for correcting angular errors in an electronic compass in vehicles |
| 07/22/1986 | US4601106 Vibration attenuator |
| 07/09/1986 | EP0186666A1 Process for determining the direction of travel of a vehicle, using an electronic compass. |
| 06/11/1986 | EP0183735A1 Electronic compass |
| 06/05/1986 | WO1986003304A1 Flux gate sensor |
| 06/03/1986 | US4593359 Vehicle navigation system |
| 05/27/1986 | US4590679 Compass systems |
| 05/21/1986 | EP0181834A2 Body for a magnetic compass |
| 04/30/1986 | EP0179634A2 Flux-gate sensor electrical drive method and circuit |
| 04/30/1986 | EP0179552A2 Direction-finding devices |
| 04/15/1986 | US4581827 Car door mirror equipped with bearing magnetometer |
| 04/09/1986 | EP0176633A1 Compasses |
| 04/02/1986 | EP0175724A1 Compass for the direct determination of the direction from a position location to a destination |
| 03/25/1986 | US4577414 Remotely readable fiber optic compass |
| 03/25/1986 | CA1202173A1 Alignment gage for dish antennas |
| 03/19/1986 | EP0174603A1 Azimuth-measuring method for inclined boreholes |
| 02/25/1986 | US4571843 Device for preventing error in a compass |
| 02/18/1986 | US4570353 For measuring the inclination and azimuth of a borehole |
| 02/13/1986 | WO1986000983A1 Compass |