Isn't that the reason certain airways have a MAA - Maximum Authorized
Altitude?
"Steven P. McNicoll" wrote in
nk.net:
"Antoņio" wrote in
message ...
I was at a CFI safety meeting today and the subject of VOR service
volumes came up. The AIM describes the Standard High Service Volume
as providing positive course guidance at varying distances depending
on your altitude--40nm at 1000ft., 100nm at 14,500ft, 130nm at
45,000ft, etc.
If the VOR is a "line of sight" signal device. How can there be
varying distances of service at varying altitudes? I mean, shouldn't
I be able to pick up a VOR radial from the moon as long as no
obstructions intervene?
Yes, and every other VOR on that frequency as well. The
altitude/distance limits ensure you won't receive an unwanted VOR
signal. Note that the service volume decreases from 130 miles to 100
miles above FL 450.
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