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| Patents for G01C 17 - Compasses; Devices for ascertaining true or magnetic north for navigation or surveying purposes (3,922) |
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| 05/10/1977 | US4023018 Navigation system and method | | 05/03/1977 | US4020559 Bearing compass | | 02/08/1977 | US4006631 Magnetic heading reference | | 01/25/1977 | US4004348 High pressure compass housing | | 12/21/1976 | US3999064 Angular displacement measuring apparatus with strobe means | | 11/09/1976 | US3991361 Semi-automatic compass calibrator apparatus for a vehicle mounted flux gate compass system to cancel out effect of local magnetic disturbances | | 09/07/1976 | US3978591 Compass, in particular for ski and competition track finding | | 08/17/1976 | US3975621 Digital compass averaging circuit | | 06/01/1976 | US3959889 Method and apparatus for determining a measured direction relative to an external magnetic direction | | 05/18/1976 | US3956831 Attitude meter with rotatable arcuate scale | | 04/27/1976 | US3952420 Digital solid state compass | | 04/20/1976 | US3950859 Angular displacement measuring apparatus | | 04/13/1976 | US3949483 Compass | | 04/06/1976 | US3948437 Automated pelorus system | | 03/16/1976 | US3944813 Photoelectric control circuit for digital magnetic compass | | 03/16/1976 | US3943763 Magnetic heading reference | | 03/09/1976 | US3942258 Earth reference thin-film magnetometer compass exhibiting total tilt immunity | | 03/09/1976 | US3942257 Index error correction for flux valve heading repeater system | | 02/24/1976 | US3939572 Latitude compensator for flux valve heading repeater system | | 02/17/1976 | US3938257 Two-cycle compensator for flux valve heading repeater system | | 02/10/1976 | US3936949 Static non-swinging course determining device on a vehicle | | 02/03/1976 | US3935645 Apparatus for indicating relative azimuth |
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