jbDC9
Well Known Member
A few months ago I finally installed a used Vizion 385 a/p in my RV-8. It. Is. Awesome. Why didn't I install one years ago?? I have it connected to my 496 GPS (RS232 wire) for nav tracking.
But, here's my issue with it; when navigating to a fix, I usually point the plane in the general direction of the fix with the Track selector, enter "Direct to" in the GPS and then select "Nav" mode on the a/p. The a/p then starts to drift a bit left, very slowly... I monitor the drift on the GPS cross track data block. It usually drifts left to show 200' cross track error, then will hold that steady as a rock. Weird! If I re-enter "Direct to", it does it again, drifts left and holds steady at 200' left of the course line. It also tracks left when on a multi-leg flight plan, so it's not just a "Direct to" glitch.
Any ideas as to what's going on here? Is there a setting in the a/p or maybe the GPS that I've missed? Has anyone else seen this? I'm glad to have basic nav tracking capability, but the offset has me puzzled...
Thanks!
But, here's my issue with it; when navigating to a fix, I usually point the plane in the general direction of the fix with the Track selector, enter "Direct to" in the GPS and then select "Nav" mode on the a/p. The a/p then starts to drift a bit left, very slowly... I monitor the drift on the GPS cross track data block. It usually drifts left to show 200' cross track error, then will hold that steady as a rock. Weird! If I re-enter "Direct to", it does it again, drifts left and holds steady at 200' left of the course line. It also tracks left when on a multi-leg flight plan, so it's not just a "Direct to" glitch.
Any ideas as to what's going on here? Is there a setting in the a/p or maybe the GPS that I've missed? Has anyone else seen this? I'm glad to have basic nav tracking capability, but the offset has me puzzled...
Thanks!