What range scales should ARPA facilities be available on?

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Multiple Choice

What range scales should ARPA facilities be available on?

Range scales for ARPA are chosen to give you both close-up precision and distant-target awareness. A short-range scale of 3 to 4 miles provides high-resolution data for targets that are near, making range, bearing, speed, and course calculations more accurate and plotting easier—which is critical for timely collision avoidance and accurate target history. A long-range scale of 12 to 16 miles keeps targets that are farther away on the display long enough to assess their trajectories and potential threats, giving you ample time to plan maneuvers. Having these two scales roughly four times apart helps keep the same targets readable and their motion predictable when you switch scales, so you don’t lose track or misjudge relative positions as you zoom in or out. Other scale pairings tend to underrepresent either near-target detail or far-target planning, or they don’t provide a comfortable, consistent transition for tracking targets across the display.

Range scales for ARPA are chosen to give you both close-up precision and distant-target awareness. A short-range scale of 3 to 4 miles provides high-resolution data for targets that are near, making range, bearing, speed, and course calculations more accurate and plotting easier—which is critical for timely collision avoidance and accurate target history.

A long-range scale of 12 to 16 miles keeps targets that are farther away on the display long enough to assess their trajectories and potential threats, giving you ample time to plan maneuvers. Having these two scales roughly four times apart helps keep the same targets readable and their motion predictable when you switch scales, so you don’t lose track or misjudge relative positions as you zoom in or out.

Other scale pairings tend to underrepresent either near-target detail or far-target planning, or they don’t provide a comfortable, consistent transition for tracking targets across the display.

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