Originally posted by

**Gabriel**View Post
2 red - 2 white means you are at most within 15' (=0.25 degrees) of the nominal glide slope. If you see at least 1 of each color you are at most within 35' (=0.58 degrees) of the glide slope.

Note that anything else than 15' gives you 3 lights of 1 color, meaning that you can see 3 white if you are barely more than 1/4 of a degree above the nominal glide slope.

HENCE the word precision.

Note that anything else than 15' gives you 3 lights of 1 color, meaning that you can see 3 white if you are barely more than 1/4 of a degree above the nominal glide slope.

HENCE the word precision.

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