GTN tracks 500 feet right of centerline

[Ragsf15e]

Awesome job actually doing it guys!

Was it really just hidden behind the bottom right mounting screw?

What type of tool did you use for the adjustment?

[DXB]

14 hours ago, Ragsf15e said:

Awesome job actually doing it guys!

Was it really just hidden behind the bottom right mounting screw?

What type of tool did you use for the adjustment?

I'm actually not sure what's back there.  The mounting screw was actually pretty long because there is a gap between my panel and the hole for the screw. Once I got a screwdriver to touch the base of that hole, a 180 degree turn toward the course was enough to take away most of my 1500 ft offset. Then it took a bunch of trial and error with small turns in both directions before I figured out how precise it could get. I did the whole thing in GPSS while on a victor airway with the default nav page of my GTN650 measuring crosstrack in real time.  I used a 1/32" screwdriver from a cheap set of jeweler screwdrivers like the one below. The black business end of the driver isn't nearly long enough, but the handle is so skinny that it fit into the screw hole in my panel and the one beyond it on the STEC30. I'm not sure a driver with even a slightly fatter handle would have worked. It took some trial and error feeling for the screw hole in the STEC30 head before I got the driver tip in the right place to work.

https://www.ebay.com/itm/332853777963?chn=ps&norover=1&mkevt=1&mkrid=711-117182-37290-0&mkcid=2&itemid=332853777963&targetid=1262779892849&device=c&mktype=pla&googleloc=9010328&poi=&campaignid=10459841973&mkgroupid=123050527180&rlsatarget=pla-1262779892849&abcId=2146002&merchantid=116333718&gclid=Cj0KCQjw8p2MBhCiARIsADDUFVF6sDZ7-O_SKSIec3X895TTWaMS0ulyxUYpUEFNXS_jI6i-WjgsQYQaAqCSEALw_wcB

BTW I did this over rural North Carolina in smooth air with no airspace or traffic nearby and a quiet radio.  Still, the attention required did lead to some loss of situational awareness.

[DXB]

14 hours ago, Jim Peace said:

got mine to go from a solid 500 feet right of track to less than 250 feet bracket left and right of course.

Tried it on a few GPS approaches and it tracked dead on to the runway....

I just need an Acclaim type S now....

Yeah I've noticed mine performs much better on LPV approaches in GPSS/HDG mode than ILS in Hi-Trk mode, which is kinda unfortunate.  

[Ragsf15e]

55 minutes ago, DXB said:

Yeah I've noticed mine performs much better on LPV approaches in GPSS/HDG mode than ILS in Hi-Trk mode, which is kinda unfortunate.  

Mine is ok in hi trk, but I prefer lo trk just for the more subtle changes it makes even if it can get slightly further off track.  
When shooting “real approaches” in the weather, I only use it past the faf about half the time because it feels weird to be manually controlling the descent (typically just with trim) and letting the autopilot control track.  My mind wants full autopilot or none.

thanks again for sharing details of the adjustment!

Edited November 7, 2021 by Ragsf15e