单项选择题
A.dead reckoning B.Pilotage C.great circle sailing D.geographic navigation
A dead reckoning (DR) plot（）.A.must utilize magnetic co...
单项选择题A dead reckoning (DR) plot（）.
A.must utilize magnetic courses B.must take set and drift into account C.should be replotted hourly D.should be started each time the vessel's position is fixed
A dead reckoning (DR) plot（）.A.ignores the effect of su...
A.ignores the effect of surface currents B.is most useful when in sight of land C.must be plotted using magnetic courses D.may be started at an assumed position
A cardinal mark showing an uninterrupted quick-flashing...
单项选择题A cardinal mark showing an uninterrupted quick-flashing white light indicates the deepest water in the area is on the（）.
A.north side of the mark B.west side of the mark C.east side of the mark D.south side of the mark
