What are the possible maximum range settings on the RANGE SELECT switch?

What are the possible maximum range settings on the RANGE SELECT switch?

• A. 10nm, 20nm, 50nm, 100nm, and 150nm
• B. 1nm, 5nm, 25nm, 75nm, 125nm
• C. 20nm, 40nm, 60nm, 80nm
• D. 15nm, 30nm, 60nm, 120nm

Answer: (A)

The range you see on a radar display is set by the Range Select switch, which defines the maximum distance the radar will show. This choice sets the display scale: shorter ranges magnify nearby targets for more detail, while longer ranges cover farther distances but with less detail. The best answer reflects a typical, practical set of maximum-range presets that sailors expect to use across varied situations—from close-in maneuvering to long-range surveillance. Having 10, 20, 50, 100, and 150 nautical miles gives sensible steps that span near to far, accommodating common navigation needs without including awkward or nonstandard values. The other option sets tend to include unusual single-digit values or miss some common long-range presets, making them less representative of what the Range Select switch actually offers. In practice, you’d pick a short range like 10 or 20 nm for crowded or tactical environments and a long range like 100 or 150 nm when you need to project targets farther away.

The range you see on a radar display is set by the Range Select switch, which defines the maximum distance the radar will show. This choice sets the display scale: shorter ranges magnify nearby targets for more detail, while longer ranges cover farther distances but with less detail. The best answer reflects a typical, practical set of maximum-range presets that sailors expect to use across varied situations—from close-in maneuvering to long-range surveillance. Having 10, 20, 50, 100, and 150 nautical miles gives sensible steps that span near to far, accommodating common navigation needs without including awkward or nonstandard values. The other option sets tend to include unusual single-digit values or miss some common long-range presets, making them less representative of what the Range Select switch actually offers. In practice, you’d pick a short range like 10 or 20 nm for crowded or tactical environments and a long range like 100 or 150 nm when you need to project targets farther away.