What is the difference between VASI and PAPI and which is the most common in “commercial” airports?
VASI/PAPI Lights (Visual Approach Slope Indicator/Precision Approach Path Indicator) are very useful for visual approaches. On a good day with very good visibility, you can see them from quite far. A normal glide slope is normally fixed at 3 degrees. As a rule of thumb, if you want to know when you will enter a glide path, just multiply your distance from the Runway by 300. If you are 10 miles from the Runway, you should be exactly 3000 feet and if 4 miles away, you should be 1200 feet.
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