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> Yes, but your heading is basically irrelevant. You want to fly a > desired track to get to a specific point, and youre not likely to > figure out the correct amount of heading change required for a given > track change either. > > Michael I do see your train of logic, however, even for GPS, you have solved only the "point the aircraft thataway" problem. Given a (say) 10 degree WCA, everything the GPS tells you is going to be wrong. It says fly to 250 degrees, you are going to actually need to fly 240. Now if you follow the pseudo HSI, that is going to be wrong, so 250 would be correct, I presume ? (wont know, the 430 does not do pseudo HSI). However, in the meantime, your compass and, presume, DG is going to be indicating 10 degrees off what the P-HSI says. Now lets get more interesting. You come around to track into the wind, so the WCA goes to zero. But it takes a second for the P-HSI to catch up to the aircraft and eliminate the difference between real heading and track (because the GPS has to establish trend). As someone else said, 10 degrees or less is about all you are going to see in WCA and therefore track to heading difference, but that difference is going to be showing up as lots of little errors between what you (and the GPS) think is happening and what is really happening. For VFR, probally not an issue, but for IFR, its *an issue*. |
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