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Old 22nd Jul 2014, 05:48
  #25 (permalink)  
Join Date: Apr 2008
Location: Denver,Co USA
Age: 72
Posts: 329

When I retired from the USAF in 1988 flying KC 135s we were still using celestial. We had an INS, but with only one it needed backup. We also had a Doppler, but over water they weren't too reliable either. Our navy's practiced cel on almost every flight.
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