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VG 85491 "Replenishment at sea - Signalling discs" documents the dimensions, parts lists and technical specifications of signalling discs used on vessels for replenishment-at-sea operations. The use of signalling discs is indispensable to ensure safe manoeuvres between vessels for replenishment-at-sea operations. The main advantage for the use of signalling discs is that they can also be used for safe communication even in the case of failure of electric/electronical signal transmission. The committee responsible for this VG standard is Working Committee NA 132-01-05 AA "Heben, Schleppen, Ankern" ("Heaving, towing, anchoring") of NSMT at DIN.
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