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Message started by boeing247 on Mar 12th, 2011 at 2:15am

Title: Re: Navigation
Post by CoolP on Mar 14th, 2011 at 5:09am
Since I'm a Sissy now  ;D, I can't be offended in any way, boeing247. So don't worry there.

I think that you've missed the fact that your "needle" only shows some deviation while the direction of this deviation depends on your setup.
http://img818.imageshack.us/img818/4057/cdicoursedeviationindic.gif
from here http://aviationglossary.com/avionics-definition/cdi/
See that "Course" knob there (labelled "OBS" for Omni Bearing Selector)? Turn it and the deviation to the left will turn into one to the right (for example). Confusing? Well, only if you don't know where to go.
So watch that Course setting and then calculate or imagine (as you like) the real direction of your Course deviation. Keep in mind that, as said, the max amount of offset visible are +-10 degrees. So make sure to stay within this corridor.
How? Turn that knob and see which Course you are currently on (in relation to the tuned station) and then act like learned before (sorry, had to put in a vague motivation phrase there) to get to the Course you had planned to go as quickly as possible.

Since we are going for VORs on the 727, the Radio Magnetic Indicator (RMI) is a useful tool, showing you the current Bearing towards the tuned station, reducing your workload on that OBS knob. So you can spot the relative location of that station with just one view on the RMI.
http://img36.imageshack.us/img36/7853/rmin.jpg
Example: The Bearing of that VOR is shown by the green needle, currently 325. So if you would fly a heading of 325 now, without any influence of the winds, you will actually overfly that station.
Now, staying on the example, if you set your Course needle to 325 (OBS knob!), it will show you the deviation from that inbound (towards the station) Course. Keep the needle centered and you will overfly the thing with a Course of 325 and thereafter continue on the 325 radial from it.
Nice navigation there!
Catching a special Course in relation to that station is another thing and takes some more room to explain, but .. the Net is awaiting you with all its beauty and wealth of information.  ;)

The FSX Learning Center (did you read What You Need to Know about VOR there? Really?) is just the very beginning of the Navigation story. Lou can tell since this chapter (together with meteorology) surely wasn't a shorter one of his career I think. But I doubt that he used FSX to learn it.  :P


But hey, I've found something to give you a moral lift.
There's a guy who collects all real world mishaps concerning the navigation thingy. So he has set up a list with documented landings (or at least attempts to) at the wrong airport.
See here "Wrong Way" Landings By Commercial Airliners (http://www.thirdamendment.com/wrongway.html)

There's a huge list and one entry is

Quote:
July 4, 1967 - A TWA 707, bound for Columbus, Ohio, mistakenly lands at Don Scott Field at Ohio State University. Link. See also Bob Thomas, "Columbus Recollections: From Stunt to Kangaroo, Aviation Has Rich History," Columbus Dispatch, January 5, 1997.

I'm looking at you, Lou.  :o (just kidding though, but maybe you know something about it or you can describe what the companies think of such "funny" things.)
"Well, Son, that was a really nice landing there but please try to catch the right location next time."  ;D

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