Under the International Code of Signals how are geographical locations such as New York City transmitted?（）

单项选择题The principal advantage of NAVTEX radio warnings is that（）.

A.they can be used by mariners who do not know Morse code
B.only an ordinary FM radio is necessary to receive these warnings
C.information on a given topic is only broadcast at specified times
D.they cover a broad spectrum of the radio band allowing reception on almost any type of receiver

单项选择题The Master shall insure that the Emergency Position Indicating Radiobeacon (EPIRB) is（）.

A.secured inside the wheelhouse
B.tested annually
C.tested monthly
D.secured in the emergency locker

单项选择题The maritime radio system consisting of a series of coast stations transmitting coastal warnings is called（）.

A.NAVTEX
B.HYDROLANT/HYDROPAC
C.NAVAREA
D.SAFESEA

单项选择题The Emergency Position Indicating Radiobeacon on a cargo vessel must be stowed（）.

A.in an inside passageway
B.in an approved bracket
C.so that it is accessible from the bridge of the vessel
D.so that it will float free if the vessel sinks

单项选择题The difference between a class A and a class B EPIRB is that the class A EPIRB（）.

A.operates on both military and civilian aircraft distress frequencies
B.transmits both an alerting signal and a homing signal
C.must be the float free type and automatically activated
D.operates with a greater output of signal power