One Range and One Bearing equal corresponds to which concept?

• A. Estimated Position
• B. Blind/Shadow Sectors
• C. Water in the Waveguide
• D. SERRATED RANGE RINGS

Answer: (A)

With only one measured range to a contact and one measured bearing to that same contact, you can’t obtain a precise fix. You’re left with an estimated position. On a radar plot, this works by representing the measured range as a circle centered on your own vessel (the distance to the contact), and the measured bearing as a ray starting from your vessel in the direction of that bearing. The contact’s location is where that bearing ray intersects the range circle. Because there’s only a single pair of measurements, this point is the best approximate location you can infer, not a definitive fix. In practice, more measurements (another bearing to the same contact, or a second range/bearing from a different reference) are needed to arrive at a true fix.

This concept isn’t about unresolved radar sectors or hardware issues like water in the waveguide, and it isn’t about serrated range rings. It’s about forming an estimated position when data is limited.