What is the typical range scale?

• A. Usually 6NM
• B. Usually 12NM but can vary depending on your situation
• C. Usually 24NM
• D. It cannot be changed

Answer: (B)

Range scale on radar determines how far out the display shows echoes. It sets the maximum distance you can see on the screen, and there’s a trade‑off: smaller scales show more detail close to you, while larger scales cover a wider area but with less detail. The typical setting is around 12 nautical miles, which provides a practical balance for many coastal and harbor situations. You can adjust it up or down based on what you need—use a smaller scale in busy approaches to get better close‑in detail, or a larger scale in open water to watch distant traffic. The idea that it cannot be changed isn’t correct, since radar range is adjustable, and while 12 NM is common, it can vary depending on the situation.