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## [TowerTalk] Let's deviate

 To: [TowerTalk] Let's deviate wa2moe@sw.incc.net (Stu Greene) Sat, 22 Sep 2001 15:51:42 -0700
 ```At 10:22 PM 9/22/01 +0000, John Farber wrote: >Magnetic declination is not the same thing as magnetic deviation. I think >you guys are talking about deviation from true North, whereas mag >declination is the vertical angle the field lines make going into the Earth, >and that varies by latitude. >John Declination, not magnetic declination, is the bearing of a celestial body from the observer. When coupled with elevation, a line of position can be obtained, Cross two or better three, lines of position and you have a geographic location or "fix". Talk to a navigator and you will understand. True heading, plus or minus variation, is called magnetic heading, ie the direction or bearing to the magnetic north pole. Add or subtract compass error (deviation) and you have compass heading. Variation in most parts of the world can be obtained by calling a local airport, or, if you prefer, doing a search on the Web. Deviation of a cheap Boy Scout compass is not worth calculating, but if you have a sophisticated large bucket compass deviation can be calculated by using an astrocompass which shows true heading. After adding or subtracting variation you look at the compass and the difference is deviation Most people who use large compasses (flyers, mariners) swing them every 15 degrees of bearing beginning at North. It takes quite a while.. If you point an antenna at a bearing where the signal is loudest you have it made. A guess at True North is good enough and while this subject recurs like the seven year itch, your antenna is OK if you use the shadow method (bulky) or Polaris (easy) Now, how many owls can be positioned on a non-polished element for maximum gain and front to back? List Sponsored by AN Wireless: AN Wireless handles Rohn tower systems, Trylon Titan towers, coax, hardline and more. Also check out our self supporting towers up to 100 feet for under \$1500!! http://www.anwireless.com ----- FAQ on WWW: http://www.contesting.com/FAQ/towertalk Submissions: towertalk@contesting.com Administrative requests: towertalk-REQUEST@contesting.com Problems: owner-towertalk@contesting.com ```
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