Hi all, this may be and probably is a user error but i will ask anyway as I seem to miss the page in the manual everytime that tells me what the problem is.When i start a route all goes well, after a couple of waypoints the plane starts wandering about 45 deg one way and then 90 back the other and then back again, not following the list. there is no discontinuations at this point.any hints appreciated,PS think the Queen is great, a lot of detail maybe to advanced for some of us but how else do we learnJohn Ashmore

A screenshot of your FMC/glareshield setup would be helpful.But if you are saying that you do not have any discontinuities, this sounds like another of those weird LNAV bugs some people have. You might use the forum search to find an alrdy existing topic about your problem. Im sure there are plenty of.