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You'll note this track takes it very close to the 48 nm WLM radar plot and also the Upper Williams River plot (Red Placemarks). I'm not too worried about the differences in the 'timestamps' in relation to these radar plots when you remember the variable accuracies and lags in the radar system and the possible lack of synchronization of the clocks back in those days. It's anybodies guess how accurate these were, but I would think that even the radar plots were more of an educated guess. The same also applies to the 330 degrees from WLM direction. According to this track and timing from the first radar ident, the 330 is about 3 degrees out and with the equipment they had in those days, I would say it would be difficult to determine that sort of accuracy... remember - at 09:28:41 in the transcript, Sector One said to Flight Information Service, "Awh, not very accurate these things... he's probably about 36".... not really something you would say if you believed they were accurate!

 

The difference between the actual 330 from WLM to the calculated position is about 2 1/2 nm, but considering that MDX was traveling with a strong tailwind at this point at anything up to 209 knots ground speed (3.48 nm/min) it will only take about 42 seconds to cover that distance, so one is not talking as huge a margin of error as it may at first seem. However, in my final trajectory, you will see that I have made allowance for this possible error.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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MDX pg 29