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| Number | Title | Issue Date |
| 7146740 | Methods and apparatus for automatic magnetic compensation A method for characterizing distortions in the earth's magnetic field caused by a vehicle having a magnetometer affixed therein is described. The method includes repeatedly measuring the distorted magnetic field utilizing the magnetometer and obtaining a three-dimen... | 12/12/2006 |
| 7069663 | Apparatus and method of calibrating azimuth of mobile device Provided are an apparatus and method of calibrating azimuth of a mobile device. The apparatus includes: a magnetic field measuring unit having a plurality of magnetic sensors aligned in a constant angle interval on the mobile device and measuring magnetic field data... | 07/04/2006 |
| 6860023 | Methods and apparatus for automatic magnetic compensation A method for characterizing distortions in the earth's magnetic field caused by a vehicle having a magnetometer affixed therein is described. The method includes repeatedly measuring the distorted magnetic field utilizing the magnetometer and obtaining a three-dimen... | 03/01/2005 |
| 6304195 | Device for altering the course of a boat A device alters a course of a watercraft including an automatic pilot with a magnetic compass. The device includes at least two coils positioned adjacent the magnetic compass, and an excitation circuit for exciting each of the two coils. The device furthe... | 10/16/2001 |
| 5952570 | Horizontal speed indicator for rotary-wing aircraft A horizontal speed indicator for a rotary-wing aircraft includes first and second sensors for determining, respectively, the heading and the horizontal speed of the aircraft. The indicator processes the signals delivered by the first and second sensors, a... | 09/14/1999 |
| 5210954 | Clinometer A gradient indicator has a clinometer arranged on a motor-driven turntable allows reversible measurements to be taken and supports the gradient indicator in precisely reproducible positions on bearing faces of the base in the various measurement positions... | 05/18/1993 |
| 4838379 | Geophone implanting and positioning apparatus An apparatus for implanting and positioning a geophone assembly into the earth is disclosed. The geophone implanting apparatus includes a receptacle for receiving and retaining a geophone assembly. A magnetic compass and a cylindrical bubble level are mou... | 06/13/1989 |
| 4394799 | Conduit bending plane indicator A conduit bending plane indicator comprising a base, a clamp for affixing the indicator to conduit to be bent, bubble level indicators to provide an indication that a bend in the conduit is coplanar with reference planes, and an angle indicator to provide... | 07/26/1983 |
| 4151656 | Manually manipulatable gyroscope-stabilized indicating apparatus and method for its use A manually manipulatable gyro-stabilized indicating instrument which may be used by pipefitters, carpenters, builders, land and road graders and the like for solving a construction problem involving determining the orientation in space of an unknown geome... | 05/01/1979 |
