BiranG said:  Surprized to hear that Loran C was used on jetliners. I had a Loran C on my sailboat and may time found my old Bendix Radio Direction Finder was just as useful for Coastal Navigation.
So on ocean flights on 707's in the 60's and 70's was doppler suitable or did you use INS?

Brian,

I never used Loran C in the jet. I was just saying that sometimes Loran C worked better than Doppler. Loran A was questionable if there was any solar activity. If the sea was calm Doppler would loose the drift sense and go to DR, sometimes for long periods. None of the TWA 707 ever had INS. Doppler was primary with Loran A & Consolan and maybe some ADF in that order. The non flying pilot would do the navigation and they were busy checking on the Doppler by taking Loran A readings and God Forbid Consolan or ADF. It's one thing in a ship to use Loran or Consolan since you're only doing 15 knots, but at 500 kts the fix is a lot harder to do and any error is greater.  The spacing on the North Atlantic was 120 NM and 2,000 feet in altitude back then, so that reflected the accuracy of the navigation systems of that day. Now, with all the fancy IRS stuff the biggest problem is a fat finger hitting the wrong number on the computer keypad.  :o

Lou