Abstract: Gyrocompass for sea vehicle comprising a pendular mechanism (2) with two dans, namely a rolling cardan (4) and a pitching cardan (5), a vertical fork (7) free to cooperate with said pendular mechanism (2), a site cardan (9) carried by said fork (7), a gyroscope with two degrees of freedom (11) carried by said site cardan (9), so that one of the two sensitivity axes (G.sub.z) is vertical, the other sensitivity axis (G.sub.y) being parallel to the axis of the site cardan (9), and its rotation axis (S) is horizontal, a horizontality sensor (12) carried by said site cardan, so that its sensitivity axis (P) is parallel to the rotation axis (S) of the gyroscope (11).

Abstract: A gyroscopic navigational installation for land and sea vehicles for provng characteristics of the trajectory of the vehicle. The installation in one embodiment includes a gimbal mounted on the vehicle and pivotable about an axis. A first gyro is rotatably supported by the gimbal about a rotational axis such that a gyro azimuth sensitivity axis is orthogonal to the longitudinal axis of the vehicle and a gyro rolling sensitivity axis is parallel to the vehicle longitudinal axis. A controlled accelerometer is supported by the gimbal such that an accelerometer pitching sensitivity axis is parallel to the vehicle longitudinal axis and an accelerometer rolling sensitivity axis is parallel to the gyro rotational axis. In an installation according to another embodiment, a second gyro is mounted on the gimbal such that a pitching sensitivity axis thereof is parallel to the rotational axis of the first gyro.

Abstract: The invention relates to devices for measuring the azimuth and the slope of drilling line. These devices comprise, in a container 1, a gyroscope 5 having two principal axes of sensitivity X--X and Y--Y and an accelerometer 12 having two principal axes of sensitivity parallel to those of the gyroscope 5; this gyroscope 5 is connected to a circuit to determine the component of the Earth's rotation vector along the axis of the drilling line.

Abstract: A device for continuously measuring the azimuth and slope of a drilling l includes a gyroscope and an accelerometer station disposed in a container suspended from a cable. The gyroscope and the accelerometer station are mounted on an inner frame pivotally mounted on an outer frame on an axis which is perpendicular both to the axis of rotation of the gyroscope and the axis of the drilling line. The outer frame is pivotally mounted in the container on the longitudinal axis of the container. An angular position detector measures the angular movements of the inner frame in relation to the outer frame. A first motor controlled by stabilization error information delivered by the gyroscope and corresponding to one axis of gyroscope sensitivity rotates the inner frame in relation to the outer frame, and a second motor controlled by stabilization error information delivered by the gyroscope and corresponding to a second axis of sensitivity rotates the outer frame in relation to the container.