reply to post by bottlenoze
Just look at any road map.....eve see highways that cross at an angle?
The routes that airplanes fly also can be at any angle. They're called Jet Airways.
Here's an example image, it's not very good (first screen grab I tried):
All of those black lines are the Jet Airway routes. They intersect usually at a navigational fix, a "beacon" that transmits a radio signal, called a
VOR. Sometimes they (the Jet Airways) will simply cross over one one another.
Here, the image above is an actual aeronautical chart issued by the NOAA and FAA, and this website has them all uploaded to view:
They have a video tutorial on their site --- or, you can follow these instructions. You want to see the "High" altitude charts, because all contrails
form from at least 25,000 feet and higher.
On the site is a globe icon....hover the mouse over it, and a drop-down menu appears. Look for the "High Enroute" tab, and the USA map will change,
showing the outlines of the various Charts.
For Oregon, click on "H-3" or "H-1"......H-1 covers most of Oregon and all of Washington, H-3 the lower third or so of OR, plus Northern California
(and areas East too).
Zoom in or out (like Google Maps or Google Earth) and find your location, and then see the types of Jet Airways over your area.
Here, I found out how to link......I picked a part of H-1 (already zoomed in a bit), with Eugene, Oregon in view....near the bottom..... zoom out or
in, slew with the mouse, etc.
BTW...although awkward, each of those charts has a legend on the side panels, at one end (easier to read them when you have the real things in your
hands), but the legends will explain the symbols and decode a lot. Also, SkyVector has a range of other Aeronautical Charts to view as well.....these
are for Instrument flying, the others for Visual flying, and show landmarks and stuff......Like this. Here's Eugene on the VFR Sectional Chart:
[Eugene just picked randomly, for example]
It appears from your post that you are in a suburb of Salem.....here's the VFR Sectional centered there:
edit on Fri 13 January 2012 by ProudBird because: (no reason given)