The difference between international and national Navtex Service is limited to（）.

单项选择题A Navtex station in each NAVAREA is usually allowed to have（）for transmission.

A.10 minutes every 4 hours
B.half an hour every other hour
C.irregular period of time
D.5 minutes every two hours

单项选择题The NAVTEX receiver can be mounted on（）.

A.on the bridge
B.in the coast station
C.on the forecastle
D.on starboard side

单项选择题The concept of NAVTEX is of a（）system for the broadcast and receipt of MSI.

A.search and rescue
B.safe
C.co-ordinated
D.hydrographic

单项选择题The broadcast of MSI is made on two dedicated systems. “dedicated” means（）.

A.special
B.different
C.expensive
D.valuable

单项选择题A SART can be fixed on（）.

A.a mother ship
B.a lifeboat
C.a life craft
D.all of A,B,C