Trident Flightdeck.
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Join Date: Sep 2002
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Trident Flightdeck.
Can anyone tell me about the moving chart in the centre of the instrument panel. I believe it was called a Doppler Map, but what was it's function, when was it used etc?
Join Date: Jul 1999
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It was a mechanically driven paper roller map with position derived from the (marine) Decca Navigator Chain. I seem to remember it was called Dectrac or something like that.
Thanks for the replies.
ENTREPPRUNEUR
Join Date: Jun 2001
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You're right, but what vision to think of the concept of a moving map long before modern technlogy was available
The problem with both of these is everybody had to use VOR so there was no point. Doppler also is no good across water and this was about the time accurate INS was arriving on the scene to wipe the floor with all the opposition.
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First generation TANS (Tactical air navigation system) used Decca and Dopplar for its information. The presentation was a lot more pleasing to the eye then reading 3 clocks and cross refering to a chart from hell, but the accuracy therin remained the same until the advent of GPS. (Which the RNS252 a TANS descendent now employs)
Using the TANS in Central America where Decca was not available was a bummer, but it did sharpen up your time and distance calcs, as skill somewhat lost these days.
Using the TANS in Central America where Decca was not available was a bummer, but it did sharpen up your time and distance calcs, as skill somewhat lost these days.
