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Post by Tom/CalClassic on Dec 18, 2014 21:53:09 GMT -5
I don't have lat and long, but the area chart I uploaded has their locations marked.
Start with the VOR SPL. It is the black diamond located on the airport as pictured. That one is easy. Then YMUIDEN is 12 NM at a heading of 331deg. from the VOR. And HARDERWIJK is 31 NM at a heading of 091 from the VOR. Both AFCAD and ADE can use this kind of location data by using guidlines and marker points. You can then get lat and long info from those programs.
Hope this helps,
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Post by Erik on Dec 19, 2014 5:48:49 GMT -5
Thanks Tom. Actually what I'm struggling with is trying to get some kind of accuracy. Using the info from the area chart to get cross bearings for navaids, I end up with deviations up to 1.75 Nautical Miles. That is quite a lot based on distances of 30 NM and less. After checking through various methods (put spherical trigonometry formulas in a spreadsheet and all - good exercise for the brain!) I cannot get matching results for key NDBs like YMU and HAR. And yes, magnetic variation taken into account. The SPL VOR was nearly 1 NM southwest from its position on the area chart until the late 80s, and that matches perfectly with the 15 NM north to SPY, for instance. However, for YMU and HAR it would help if it had been at the drawn position, further northeast. That is, assuming SPY was then where it is now, and it was AFAIK. Hope this still makes sense to the reader. I have a lot of Schiphol info from the 70s on, but that didn't solve it either. Oh well, for the time I will just try and navigate at least as accurate as I can get the navaids! Thanks again, Erik edited for spelling
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Post by Tom/CalClassic on Dec 20, 2014 12:00:04 GMT -5
Have you taken into account the *change* in magnetic variation between the 1960's and 2003?
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Post by Erik on Dec 20, 2014 17:18:50 GMT -5
Yep, including some X-checking with later data. I realise the 'problem' lies with me though, either I'm missing something or I'm looking for accuracy that probably cannot be provided by the charts (due to rounding off et cetera).
That said, the ones you shared with us, Tom, are by far the most informative I have seen anywhere for Schiphol in the 60s. Exactly the info that's needed for proper departures and arrivals at the old Schiphol!
Erik
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Post by Tom/CalClassic on Dec 20, 2014 20:57:02 GMT -5
I think you're right about the accuracy. Glad to help.
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