Voyage data recorder
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Voyage data recorder, or VDR, is a data recording system designed for all vessels required to comply with the IMO's International Convention SOLAS Requirements in order to collect data from various sensors on board the vessel. Wikipedia
Authorized VDR APTs: Netwave, Danelec, JRC, Furuno, KH, Highlander, Samsung, MacGregor AMI. Annual VDR Performance Test, Replace, Install...