ITU-R QUESTION 985-1990 Transmission of digital data for the updating of electronic chart display systems《数字数据传输在电子海图显示系统更新中的应用》.pdf
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1、QUESTION ITU-R 98/5*,*Transmission of digital data for the updating ofelectronic chart display systems(1990)The ITU Radiocommunication Assembly,consideringa) the Maritime Safety Committee of the International Maritime Organization (IMO) hasapproved Provisional Performance Standards for Electronic Ch
2、art Display Systems (ECDIS) at itsfifty-seventh session (1989);b) the IMO has invited the ITU-R to undertake a technical study of the most appropriatesystem and data medium which should be used for transmission of updating information to shipsusing satellite and terrestrial techniques and to recomme
3、nd the most appropriate methods for suchtransmissions;c) the present method of updating paper charts consists of the weekly mailing of printed datawhich contain numerous single feature corrections and small sections of charts that are compiled bynational Hydrographic Offices, and which the mariner m
4、anually applies to paper charts;d) the existence of ECDIS offers the opportunity to obtain the timely automatic updating ofthe Electronic Navigation Chart (ENC) by supplying Hydrographic Office produced digital data viaterrestrial or satellite telecommunications to ships at sea or in port;e) the tec
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