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?

Question

Accepted Answer

They always appear on a bearing of 90° from the true bearing of the contact.

Answer

The indirect echoes usually appear in shadow sectors.

Answer

When plotted, their movements are usually abnormal.

Answer

Their bearing is almost constant, even when the true bearing of the contact changes appreciably.

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