In order to ensure that a RACON signal is displayed on the radar，you should（）.

单项选择题In a crossing situation，the stand-on vessel should normally（）.

A.take action to cross ahead of the other vessel
B.take action to pass astern of the other vessel
C.maintain course and speed
D.change course and increase speed

单项选择题You may find the time of slack water after low water in a certain port from（）.

A.Deadweight Scale
B.Tide Tables
C.Notices to Mariners
D.Table of Azimuth

单项选择题The satellite system of GAMDSS comprise（）.

A.NAVTEX, COSPAS/SARSAT, EPIRBs and Status Recording-system
B.Inmarsat,COSPAS/SARSAT, EPIRBs and Status Recording-system
C.NAVTEX, Inmarast,EPIRBs and SART
D.Inmarsat, direct Printing Telegraphy

单项选择题The terrestrial system of GMDSS consists of（）.

A.radio-telephony, DSC, Direct Printing Telegraphy,Navtex and SART
B.INMARSAT, DSC, Direct Printing Telegraphy, Navtex and SART
C.radio-telephony,DSC,EPLRB,Navtex and SART
D.Status Recording system,DSC,Direct Printing Telegraphy, Navtex and SART

单项选择题An（）indicates that there is imminent risk for navigation.

A.distress alert
B.urgency message
C.safety message
D.routine message