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| Number | Title | Issue Date |
| 7353614 | Vehicle compass system with continuous automatic calibration The compass system of the present invention utilizes an improved calibration routine in which a processing circuit of the compass recalibrates the compass each time three data points are obtained from a magnetic field sensor that meet predetermined criteria. One suc... | 04/08/2008 |
| 4577414 | Remotely readable fiber optic compass A remotely readable fiber optic compass. A sheet polarizer is affixed to a magnet rotatably mounted in a compass body, such that the polarizer rotates with the magnet. The optical axis of the sheet polarizer is preferably aligned with the north-south axis... | 03/25/1986 |
| 4481718 | Adjusting arrangement for compass repeaters The compass repeaters of a gyro-compass are adjusted by a follow-up motor (1) in response to differential signals between the north-indicating gyro-system and a gyro-system enveloping bowl (18) which is connected to the compass card. In order to permit ad... | 11/13/1984 |
| 4414752 | Device for the correction of an error in the electric transmission of an indication To correct latitude-related errors in the delivery of data from a gyrocompass to an indicator through a synchro transmitter with three-phase Y-connected primary and secondary windings, the synchro transmitter is energized from a single-phase a-c source ha... | 11/15/1983 |
| 3967384 | Start-up conditioning means for an azimuth reference In an azimuth reference system including a flux valve coupled to a synchro stator and a directional gyro having its outer gimbal mechanically coupled to the synchro rotor, a low power electronic slaving circuit having its input electrically coupled to the... | 07/06/1976 |
