Just FYI, first time I've seen this. Happen in the 8-9 waypoint leg as well. I tried correcting back on course with HDG mode and when I put it back in INS, it immediately went off track again.

Hi, can you send the Simbrief RTE PLN you used here, I don't believe this was encountered in testing;

Does this only occur when transitioning to the 8-9 Segment or did this occur prior?
Has this occurred on any other differing routes with less than 8 WPTs?
Did you auto-import or manually enter the routes?
What is your alignment settings (Realistic, Fast, Slow)?

Anything else that can be recalled or referenced to in the next time you fly this would be helpful when able, thank you :)

Hey,

It's on all waypoints. I'm still flying to see if it would figure itself out.

Auto-import into the INS, haven't tried anything with less waypoints.

Fast alignment settings. It has progressively got worse as the flight goes on. Here's another screenshot and the flightplan. As it came to the waypoint here, it missed it so badly it tried to turn around. I went heading mode, loaded 6-7 for the track and now it's trying to recapture and is still offset. I'm 99% sure that I entered the starting gate correctly, but before you guys go digging around let me finish this flight and I'll reset the INS' and try again.

I tuned up a VOR, and if I had to guess, it's not compensating well for winds in INS mode.

KMIAKLGA01.fpl

Edited 4 hours ago4 hr by fishermanivan

So it's almost certainly wind, and not correcting enough. Loaded up Sydney to Kai Tak,

Look at the wind in INS2, and the cross track, it's not compensating enough and getting blown off track.

It's also hunting headings as well, when it gets to waypoints that are on the same track, it turns away, then comes back... currently heading to a waypoint 35 miles away and it's in a 2-3 degree bank while still offset from the CDI needle.

Edited 1 hour ago1 hr by fishermanivan