Wayne Paul wrote:
Here are a few more references to add to the discussion.
http://en.wikipedia.org/wiki/Horizon
http://www.firestik.com/Tech_Docs/dist2horizon.htm
http://www.rudhar.com/vizhoriz/vizho-en.htm

Wayne
HP-14 "6F"
http://www.soaridaho.com/


"RST Engineering" wrote in message
...

The equation may be written in either of two common formats:

h = horizon (in statute miles)
a = altitude (in feet)

h = sqrt (2*a)

or

h = 1.414 * (sqrt (a))

If we are ballparking instead of surveying, we generally drop it to 1.4.


Jim





Ok, I think I got it figured out...

Nautical miles vs Statute!


Thanks guys.

Richard