| Patents for G01C 21 - Navigation; Navigational instruments not provided for in groups (52,650) |
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| 11/29/1977 | US4060718 Geodetic survey method |
| 11/29/1977 | US4059993 System for monitoring water flow angle relative to a boat keel |
| 11/15/1977 | US4057906 Navigational instruments |
| 10/11/1977 | US4053893 Method of and apparatus for indicating the geographical position of a pilot vehicle |
| 10/11/1977 | US4053749 Distance meter for vehicle capable of displaying travelling distance to destination |
| 10/04/1977 | US4052654 Gyro stabilized inertial reference system with gimbal lock prevention means |
| 08/02/1977 | US4038876 Acceleration error compensated attitude sensing and control apparatus and method |
| 07/26/1977 | US4038527 Simplified strapped down inertial navigation utilizing bang-bang gyro torquing |
| 06/28/1977 | US4032759 Shipboard reference for an aircraft navigation system |
| 06/28/1977 | US4032758 Compensated vehicle heading system |
| 06/14/1977 | US4030065 Terrain clearance warning system for aircraft |
| 05/17/1977 | US4024493 Apparatus for motor vehicle position indication |
| 05/10/1977 | US4023018 Navigation system and method |
| 05/10/1977 | US4022150 Sailboat steering indicator system |
| 05/03/1977 | US4021716 Reactionless gimbal drive system |
| 05/03/1977 | US4020702 Redundant inertial measurement system configuration |
| 04/26/1977 | US4019392 Torquing system for stabilizing inertial platforms |
| 03/22/1977 | US4012851 Universal planisphere complete guidance and computer system |
| 03/15/1977 | US4012713 System for providing an indication of wind shear |
| 01/25/1977 | US4004460 Ship movement measurement |
| 11/16/1976 | US3992106 Error cancelling scanning optical angle measurement system |
| 10/26/1976 | US3988735 Control circuit for driving a position indicator in an aircraft flight data display |
| 10/12/1976 | US3986092 Stabilization system for a platform suspended in a gimbal frame |
| 10/05/1976 | US3983630 Navigational charting and calculating device |
| 09/21/1976 | US3981588 Means and method for determining meridian location and azimuth |
| 09/21/1976 | US3981080 Mechanical device for astronomical calculation |
| 09/14/1976 | US3980362 Position finding and course determining instrument |
| 09/07/1976 | US3979090 Velocity damped erection system for stable gyroscopic attitude and heading reference apparatus |
| 07/20/1976 | US3971018 Marine traffic conflict assessment system |
| 07/13/1976 | US3968684 Apparatus and method for determining optimum direction of process of sailing vessels |
| 06/29/1976 | US3967098 Navigation instrument |
| 06/01/1976 | US3961166 Vehicle locating apparatus |
| 05/18/1976 | US3957199 Navigational aids |
| 04/20/1976 | US3952208 Device for controlling the position of a first body relative to that of a second body |
| 04/13/1976 | US3949597 Gyroscopic device for locating the geodetic point of route |
| 04/06/1976 | US3947973 Navigation teaching aid |
| 03/30/1976 | US3947810 Negative climb rate after take-off warning system with predetermined loss of altitude inhibit |
| 03/30/1976 | US3947809 Below glide slope advisory warning system for aircraft |
| 03/30/1976 | US3947808 Excessive descent rate warning system for aircraft |
| 03/23/1976 | US3946358 Aircraft ground proximity warning instrument |
| 03/23/1976 | US3945720 Map displays |
| 03/16/1976 | US3944968 Aircraft ground proximity warning system having speed versus altitude compensation |
| 03/16/1976 | US3943764 Sailboat steering indicator system |
| 03/02/1976 | US3941983 OMEGA-VOR/DME positional data computer for aircraft |
| 02/24/1976 | US3940597 Navigational error correcting system |
| 02/03/1976 | US3936716 Stabilisation system |
| 02/03/1976 | US3935828 Method and apparatus for obtaining maximum sail boat velocity |
| 01/20/1976 | US3934222 Terrain closure warning system with climb inhibit and altitude gain measurement |
| 01/20/1976 | US3934221 Terrain closure warning system with altitude rate signal conditioning |
| 01/13/1976 | US3931747 Gyroscopic stable reference device |