As the old and bold are wont to say,”if it’s got dust on it, don’t touch it”. Sadly it’s behind a Mcdu screen and therefore that’s easier said than done.
It is obviously a hark back to pre GPS days, not dissimilar to the Boeing purge function used to remove inaccuracies after a long period of IRS only nav, or with dubious DD or VOR D updating etc. However it does appear even now on certain models of Airbus, and I can confirm, unfortunately, that it does still work. To be fair to AIB it does give you ample opportunity to confirm your actions. However, it will do exactly as it says on the tin, and update your posn, (albeit quite briefly as the GPS Positioning starts to reassert itself again), to the place selected.
Last edited by MENELAUS; 13th Dec 2020 at 01:56.