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?
• Indirect radar echoes (reflected echoes) vs. true echoes • How bearing behavior (does it stay constant or change?) helps identify false/indirect echoes • Typical location and motion pattern of indirect echoes on the radar screen
• Think about how a reflection off your own vessel would behave: would its bearing from your radar stay fixed or change as the true target moves? • If an echo is indirect, will it reliably appear at some fixed angle (like 90°) from the true contact in every situation, or can it show up in several relative positions? • Consider which statement sounds like an absolute rule that would rarely be true in the real, messy world of radar reflections.
• Verify which options describe general tendencies ("usually", "almost constant") versus absolute conditions ("always"). • Check your radar knowledge: do indirect echoes commonly show abnormal motion when plotted? • Ask yourself: do indirect echoes have to appear in shadow sectors, or is that only something that can happen sometimes?
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