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Originally Posted by starman
As you can see from the chart, 220.7 on a compass , elevation 40.7 would be pointing at IA5 from your location,
Manassas, VA 22110
Latitude 38° 46.134'N Longitude 77° 29.370'W
Sat Name Sat Lng Az(t) Az(m) El Skew
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Telstar 5 97.0W 209.5 220.7 40.7 22.6
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I know this isn't an important difference, but after reading this post, I decided to see how the results compared to my own programs, I noticed that I came up with a slightly different number for the magnetic azimuth, ie about 219.8 instead of 220.7, I was curious where the difference came from. Turns out my programs agreed on everything except for the magnetic deviation, ie difference between true azimuth and magnetic azimuth. It looks like the info above suggests a magnetic deviation of 11.2 . I use the program found at
http://www.ngdc.noaa.gov/seg/WMM/soft.shtml , which seems to give me a deviation of 10.3 , which is supported by a map you can download at the same NOAA site. I assume that the program that generated the info above used a different model or something. While .9 degrees doesn't mean much difference with respect to the current project of locating IA5, 0.9 degrees seems to be a pretty big difference for other purposes, like navigation, which makes me curious what the source of the magnetic deviation is.
Just curious.... again, makes no significant difference here, as the calculations are just to get you close enough to peak on a signal.