HORIZONT 3 is a multispectral modular-type optoelectronic device intended for use as a part of surveillance and reconnaissance systems. The system Horizont 3 can be used stationary and as a self-contained device installed on a tripod, mast, or vehicle. Horizont 3 is easily integrated with other means of technical reconnaissance. Its optical module consists of a thermal imaging camera, a day camera and a laser rangefinder. Cameras are installed on a pan-and-tilt gyrostabilized platform that provides guidance in azimuth and angle of elevation in manual and semi-automatic or automatic patrolling mode. The platform is installed permanently or on a telescopic mast.