Which of the following are data layer categories to be displayed on ECDIS（）．<br>A:ECDIS warnings and messages<br>B:Hydrographic Office data<br>C:Notice to Mariners information<br>D:All of the above

Which of the following are data layer categories to be displayed on ECDIS（）．
A:ECDIS warnings and messages
B:Hydrographic Office data
C:Notice to Mariners information
D:All of the above

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