A.measuring the thickness of the tail shaft liner B.taking the vessel's offsets to check for hull deformation C.testing and examining the anchor cables for defective links D.drilling or sonic-testing the hull to determine the plate thickness
A.in high latitudes B.near the equator C.on north or south headings D.on intercardinal headings
A.An agonic line B.The magnetic equator C.A magnetic meridian D.All of the above
A.one B.two C.three D.four
A.magnetism from the earth's magnetic field B.misalignment of the compass C.magnetism within the vessel D.a dirty compass housing
