A、prevent any possible accident at sea
B、prepare a reasonable forecast of the wind and weather
C、help the mariner to fix a accurate ship's position
D、aid the salvage of a ship in peril
更多“By plotting the analysis messages on weather charts，we are able to（）.”相关的问题
A、calculating amplitudes B、calculating great circle sailings by the Agiton method C、entering the Air Navigation Tables (Selected Stars) Pub 249 D、plotting on star finders
A、Current can be determined by measuring the direction and distance between simultaneous EP and DR positions B、The drift of the current should be averaged out on a one hour basis C、After the current is determined，it should not be used for further plotting because it is an unknown variable D、The distance between a simultaneous DR position and fix is equal to the drift of the current
A、Their bearing is almost constant，even when the true bearing of the contact changes appreciably B、They always appear on a bearing of 90°from the true bearing of the contact C、The indirect echoes usually appear in shadow sectors D、When plotted，their movements are usually abnormal
A、A.Their bearing is almost constant，even when the true bearing of the contact changes appreciably B、B.They always appear on a bearing of 90°From the true bearing of the contact C、C.The indirect echoes usually appear in shadow sectors D、D.When plotted，their movements are usually abnormal
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、Easily plotted on a Mercator chart B、Negligible increase in distance on east-west courses near the equator C、Does not require constant course changes D、Plots as a straight line on Lambert conformal charts
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