You have another ship overtaking you close aboard to starboard. You have 3 radar targets bearing 090° relative at ranges of .5 mile, 1 mile, and 1.5 miles. In this case, the unwanted echoes are called __________.

Correct Answer: Option C — multiple echoes

Multiple echoes occur when a radar pulse reflects back and forth between the ship and a nearby large target, such as another vessel. The radar receiver detects these secondary returns at multiples of the original range, appearing as a series of targets on the same bearing, as described in Bowditch.