Hi all in the forum. Could someone please give me an answer regarding flight levels and RVSM. I assume by now that all of europe is using this system. I have read that all Easterly flights from 0 to 180 are odd and all westerly flighghts from 181 to 359 are even. So if I am flying a flight from Gibralta to London Gatwick and my flight seems to be mainly around 0 to about 020 should this be odd or even? to me it should be odd, but i filed an odd flight plan and was asked by ATC to change to even. As i was the only aircraft in that region i dont think it was a safety issue. So can someone please explain the rules as I am getting a little disappointed with myself for not understanding a simple procedure of odds and evens.Thanks in advance for any repliesJohn Calleja

Hi John,I am not fully up to speed with correct altitudes but I do think I know where your problem lies. Much of Europe uses the easterly / westerly rule that you describe but as far as I know in French and Spanish airspace they use Northerly and Southerly rules. So that would mean all flights going north would file even altitudes and southerly flights file odd altitudes.I do stand to be corrected on this though!Regards,Richard