You have been observing your radar screen...

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Question 1 of 2066636ee928f7522a1c519d64

You have been observing your radar screen and notice that a contact on the screen has remained in the same position, relative to you, for several minutes. Your vessel is making 10 knots through the water. Which statement is TRUE?

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Question 1 of 20

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🔍 Key Concepts

• Relative motion vs. true motion on radar • What it means when a contact has no relative movement on the radar screen • The relationship between your own course and speed and the target’s course and speed

💭 Think About

• If the contact’s position on your radar screen does not change while you are moving at 10 knots, what does that say about the contact’s motion relative to you? • How would a target on a reciprocal course at the same speed appear on your radar – would it stay fixed, move toward the center, or move outward? • What kind of target motion (same, opposite, or different course/speed) would make a radar contact appear to stay in exactly the same place on the screen?

✅ Before You Answer

• Confirm that no relative movement on the radar display usually indicates a constant bearing situation. • Think about whether dead in the water would appear fixed in range and bearing while you are moving, or if the range would change. • Ask yourself: if another vessel has the same course and speed as you, how would its relative position appear on your radar over time?

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