2IHO S-52,Specification for chart content and display aspects of ECDIS[S].3rd.Ed.Monaco:IHB,1993:21-50.
3IEC 61174,Maritime navigation and radio communication equipment system-Electronic chart display and information system (ECDIS)-Operational and performance requirements,methods of testing and required test results[S].Geneva:International Electro-technical Commission,2001:22-37.
