Abstract: Uniquely integrating a search mirror and a deflection mirror with a passive ptical rangefinder and a remote sextant, enhances the operation of both devices. The improved rangefinder/sextant provides day/night 360.degree. azimuthal and at least -5.degree. to about 60.degree. elevational search capability with the additional capability of pointing the search mirror at a navigational star in a direction different from that of an imaging camera. Thus, the imaging camera, can be pointed at the sea horizon that is least obscured by haze and/or sea clutter, thereby allowing altitude readings under adverse conditions.

Abstract: The present invention entails a multi-channel fishscope that includes an expandable microprocessor unit that is adapted to receive echo profile signals from one or more transmitter-receiver modules and through voltage comparatory networks generating an output video signal that is directed to a CRT of a television monitor. There the echo profiles are transformed into signature traces on the TV monitor that represent fish or other target objects. By the provision of a search/scan module with timing control provisions, the depth of the traces is scaled onto the TV monitor in order to indicate depth and relative position.

Abstract: A passive opto-electric rangefinder with remotely controllable index mirr independently rotatable about normal axes, each axis perpendicular to the line-of-sight.

Abstract: The present invention provides within a ship, a passive electro-optic dev for providing a measurement of the range, together with a positively identifiable image of an approaching ship or object day or night on a CRT, with the range displayed digitally on the CRT. The rangefinder capability provides a substitute or supplement to radar or active-gated laser beam rangefinders for collision avoidance and station-keeping.