Which factor is not used to adjust basic daytime visual Sweep Width (W) values?

• A. Weather
• B. Crew fatigue
• C. Speed (aircraft only)
• D. Humidity

Answer: (D)

The main idea here is understanding what factors actually change how wide a sweep you can reliably detect in daylight searches. The adjustments to Sweep Width reflect real constraints on detection: how visibility is affected by weather, how alert and capable the observer is when tired, and how fast you’re moving which changes how long you have to scan each area. Humidity isn’t treated as its own separate adjustment factor in the standard daytime W calculations. Its impact on visibility is either absorbed into the general weather category or considered negligible for the purpose of the W adjustment. So humidity isn’t used to modify basic daytime visual Sweep Width values.