A gimbal mechanism for a turret includes a support member and a pair of opposing yoke arms extending from the support member. The pair of opposing yoke arms define a first axis. A sphere is rotatably mounted between the opposing yoke arms for rotation about the first axis. A disk is rotatably mounted within the sphere for rotation about a second axis perpendicular to the first axis. The disk is sized for rotation within the sphere. The second axis may be offset from the first axis. An aperture is provided in the disk. The sphere includes a slot within which the aperture is moveable in response to rotation of the disk about the second axis. The aperture is movable to define a field of coverage in response to rotation of the sphere about the first axis and the disk about the second axis.