Visual Approach Slope Indicator

The visual approach slope indicator (VASI) is a system of lights on the side of an airport runway threshold that provides visual descent guidance information during approach. These lights may be visible from up to 8 kilometres (5.0 mi) during the day and up to 32 kilometres (20 mi) or more at night.

Other articles related to "visual approach slope indicator, slope indicator, visual, approach":

Visual Approach Slope Indicator - Types - Stabilised Glide Slope Indicator (SGSI)
... The stabilised glide slope indicator is used on moving landing platforms such as aircraft carriers ... the effects of the ship's roll and pitch and provides the pilot with visual information relating to the approach angle ...

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