propellers is ________ .

A.brass B.copper C.lead D.zinc

61.Deviation in a compass is caused by the ______. A.vessel's geographic position B.vessel's heading C.vessel's magnetic field D.influence of the magnetic materials of the vessel

C63.______ the repeater compass with the master compass，please． A.Similize B.Clock C.Synchronize D.Position 64.Automatic identification systems (AIS) are expected to broadcast all

of the following information EXCEPT ________ . A.navigation status B.ship's heading C.port of origin D.time stamp

67.Which feature，when set to zero，might allow a GPS unit to have an

accuracy equivalent to Precise Positioning Service receiver capability? A.Transit B.Selective Availability C.Auto-correlation D.Anti-spoofing 71.I have steerage way.It is said that ______. A.I am underway B.I am out of control C.I am not making way through the water

D.I have the amount of movement forward which the ship needs to be steered properly