VASI vs. PAPI: Understanding the Differences and Similarities
Pilot Institute
OCTOBER 17, 2024
The Visual Approach Slope Indicator (VASI) is a Visual Glide Slope Indicator (VGSI) placed near a runway to help you land safely. This system of lights is visible from 3-5 miles during the day and 20 miles at night. The PAPI provides safe obstruction clearance within plus or minus 10 degrees of the extended runway centerline and 3.4
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