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An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes? ()

发布日期:2021-03-22

An indirect radar echo is caused by a reflection o...
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

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水路交通运输技能考试

海船船员考试

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