If you do NOT understand the course or intention of an approaching vessel you should sound （）.

If the PSCO from general impressions or observations on board has（）for believing that the ship，its equipment or its crew do not substantially meet the requirements，the PSCO should proceed to a more detailed inspection.

A.clean report
B.serious deficiencies
C.clear ground
D.detention report

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If a ship is proceeding towards the magnetic equator，the uncorrected deviation due to permanent magnetism（）.

A.increases
B.remains the same
C.decreases
D.is unimportant and may be neglected

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