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#9
August 26th 03, 06:09 PM
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John Bell wrote: The Garmin 196, 295, 400, and 500 series appear to correct for this variation problem when the VOR is the active waypoint. The GPS III Pilot does not. The problem is that the VOR is aligned to magnetic north, but is not realigned as the magnetic variation changes over time. Thus, this is really a VOR problem. However, the GPS receivers that I mention compensate for this. Do you mean to say they compensate for the lack of realignment by using the navaid's published "declination" instead of the actual alignment of magnetic north? I am skeptical. My understanding is they use an approximation like a best-fit polynomial or similar to derive the magnetic declination at any given location. Dave Remove SHIRT to reply directly. 
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