ACOUSTIC DETECTION + SONAR (NAVIGATION OF SHIPS)
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BTNAVIGATION OF SHIPS (TRANSPORTATION AND TRAFFIC)
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UDC656.69*4
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Descriptor GERSCHALLORTUNG + SOUND NAVIGATION AND RANGING (SCHIFFSNAVIGATION)
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Descriptor ENGACOUSTIC DETECTION + SONAR (NAVIGATION OF SHIPS)
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Descriptor FREDÉTECTION ACOUSTIQUE + SONAR (NAVIGATION DE NAVIRES)
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Variant GERORTUNG/SCHALLORTUNG (SCHIFFSNAVIGATION)
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Variant GERSONAR (SCHIFFSNAVIGATION)
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Variant ENGDETECTION/ACOUSTIC DETECTION (NAVIGATION OF SHIPS)
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Variant ENGSOUND NAVIGATION AND RANGING (NAVIGATION OF SHIPS)
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Variant FREACOUSTIQUE/DÉTECTION ACOUSTIQUE (NAVIGATION DE NAVIRES)
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Variant FRESONAR (NAVIGATION DE NAVIRES)
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RTACOUSTIC MEASUREMENT
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RTECHOLOT + SONAR (OCEANOGRAPHY)
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RTNAVIGATION INSTRUMENTS