Archived posting to the Leica Users Group, 2004/06/17

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Subject: [Leica] UFO
From: s.jessurun95 at (animal)
Date: Thu Jun 17 14:12:12 2004
References: <25414659.1087504945405.JavaMail.www@wwinf3001> <>

> > No major airports in the vicinity but you are absolutely correct.
> > Closer inspection showed it to be the 'Property of Air Traffic Control
> That's a VORTAC. A VORTAC is a VOR and a TACAN in the same building.
> A VOR is a VHF Omnidirectional Ranging beacon.
> VHF is the name of the radio frequency used.
> Omnidirectional means it sends in all directions (that's why it has that
ring of antennas around it).
> Beacon means it sends to you, rather than you sending to it.
> VORs send airplanes signals that the airplanes can use to navigate.
> A TACAN is a TACtical Air Navigation station. It sends VOR-like signals on
a different frequency, and responds to DME (Distance Measuring Equipment)
probes from airplanes equipped with it. In other words, a DME-equipped
airplane can hear a TACAN, send out a probe saying "How far away am I?" and
get an answer back from the TACAN.
> If I were a Very Bad Person and I wanted to make the world stop, I would
coordinate the destruction of a bunch of VORTACS. Airplanes wouldn't be able
to fly so well any more.
We would hardly notice.
Most modern planes use inertial navigation with occasional position updating
That can be from star trackers.Visual landmarks ,indeed DME,s and usually
GPS.\best regards

In reply to: Message from geebeephoto at (Graham Battison) ([Leica] UFO)
Message from reid at (Brian Reid) ([Leica] UFO)