FIELD: optical navigational aids; laser and optical devices for navigation of ships, flying vehicles and other transport facilities. SUBSTANCE: device contains two optical radiation sources located at distance in space. Each source produces at least two optical radiation beams; one beam of each source has coinciding bands of wave length. Optical beams with coinciding bands of wave lengths are overlapped in transit. Beyond transit, these beams are overlapped by beams of optical radiation of other bands of wave lengths. EFFECT: enhanced efficiency. 8 cl, 2 dwg
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