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On Apr 6, 8:56 am, "Peter Dohm" wrote:
"RomeoMike" wrote in message ... wrote: Astro navigation, but it's still an angle away from a standard vector. So different sciences are using the same word with different meanings. However, you're of course correct that for magnetic navigation, declination and variation are the same thing. http://www.ngdc.noaa.gov/seg/geomag/faqgeom.shtml Kev Thanks to you, farr1220, and Peter. I always wondered in the back of my mind how the term declination came to mean variation. Now I'm ready to navigate the outer space :-) Hmmmm. I see that what I have been calling declination is called inclination on the NOAA site, so I will correct as appropriate. In view of my recollections of ground school, I believe that it might be least confusing to continue using the term deviation for the instrument error as installed, variation for the difference between true and magnetic north, and inclination for the angle between the lines of force and the horizontal--leaving the term declination unused. Yes and then aviators would be in perfect alignment with ocean naavigators who use variation and deviation. The conversion from true to compass heading makes a nice nemonic: timid virgins make dull company for TRUE (variation) MAGNETIC (deviation) COMPASS Cheers MC |
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![]() Thanks to you, farr1220, and Peter. I always wondered in the back of my mind how the term declination came to mean variation. Now I'm ready to navigate the outer space :-) Hmmmm. I see that what I have been calling declination is called inclination on the NOAA site, so I will correct as appropriate. In view of my recollections of ground school, I believe that it might be least confusing to continue using the term deviation for the instrument error as installed, variation for the difference between true and magnetic north, and inclination for the angle between the lines of force and the horizontal--leaving the term declination unused. Yes and then aviators would be in perfect alignment with ocean naavigators who use variation and deviation. The conversion from true to compass heading makes a nice nemonic: timid virgins make dull company for TRUE (variation) MAGNETIC (deviation) COMPASS Cheers MC That's the nemonic that I was taught--and then forgot. :-( Peter |
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