单项选择题
A.magnetism from the earth's magnetic field B.misalignment of the compass C.magnetism within the vessel D.a dirty compass housing
Before a magnetic compass is adjusted certain corrector...
单项选择题Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the（）.
A.fore-and-aft and athwartships magnets B.dip needle and heeling magnet C.heeling magnet and Flinders bar D.Flinders bar and quadrantal spheres
Based on your 2209 fix，which would be a warning that yo...
单项选择题Based on your 2209 fix，which would be a warning that you are being set down on Block Island Sound South Entrance Obstruction Lighted BIS Buoy? （）
A.Decreasing loran readings on 9960-W B.Visual bearings of Montauk Point Lt. changing to the left C.Increasing bearings of Southeast Point Light D.Decreasing soundings
Based on a DR，at approximately 1817 you would expect to...
单项选择题Based on a DR，at approximately 1817 you would expect to（）.
A.enter a traffic separation zone B.cross a submerged pipeline C.depart a regulated area D.depart a restricted area
