Hi PN,
I meant flying through the wind "jetstream" (in a Domine). You had to calculate the wind based upon your last fix and plotted heading, and then use that wind for the next leg calculation - if you didn't you were penalised. If you happened to fly through a jet stream, during your 3 position line fixing then you had to apply that wind regardless of the fact that the wind had subsided by the end of your leg! If, like me on one occasion, you applied common sense and airmanship by using a more sensible wind then you failed the sortie with a raft of application errors (A7s) because that was the rules!
The problem with the North Sea Route was the lack of fixing aids, and you were often left with a consul line from Stavanger (count the dots and dashes) which was a pain, and gave a big cocked hat leading to fix point errors and the possibility of "majors".
I am so glad that I was "radar" and not a plotter! I bet the Navs today havn't even seen a Dalton computer!