d = square root (h^2 + 2hr)
where:
h = height above earth's surface
r = earth's radius = 6371km or 19418808ft
1000 FT = 32.4 NM
10000FT = 102.5 NM
This gives the visible horizon from one point. If you want to figure out the range between 2 elevated objects, then add together the 2 values of d.
So that would make it
d (in NM) = 1.025 x square root height in feet
Last edited by Ex Douglas Driver; 21st September 2003 at 12:19.