单项选择题
Charts showing the coast of Mexico are produced by the United States（）.
A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service
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Chart legends which indicate a conspicuous landmark are printed in（）.
A.underlined letters
B.capital letters
C.italics
D.boldface print -
单项选择题
Chart legends printed in capital letters show that the associated landmark is（）.
A.inconspicuous
B.conspicuous
C.a government facility or station
D.a radio transmitter -
单项选择题
Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.
A.coast to aircraft operational communications
B.aircraft to ship operational communications
C.lock & bridge communications
D.aircraft to ship navigational communications
