"Mark my words this is going the way of the gun control argument, except there's no NDA (National Drone Association) to lobby for us.  "

"Ran three packs today, GPS in MUCH better shape, now I just have to fix my declination and yaw issues. The config file you sent Stephen seems to work well, no jumping around. I'll test it on my trad Heli as well and confirm. I did also add a…"

"Thanks Stephen, I'll give it a try.  "

"Guys don't know if this helps:   On machine 1 (trad heli)  I noticed the jumping behavior on a newly installed APM 2.5/Ublox and sort of resolved it with a ground plane plate below the GPS unit.    On machine 2 (hexa) I…"

"Ok today was a lot better, did 2 things different 1) let the machine sit on disarmed for about 10 minutes. 2) added an aluminum ground plane plate under the GPS and mounted it another .25" higher above the apm. I'll try to get a couple…"

"Read that thread front to back. I'm getting similar behavior with the ublox as described in that thread for the mtk. It definitely moves around a lot and the position variance when it goes is at least 30m or so. I'll try and get out to…"

"Paul,     I'm pretty sure that it's nothing to do with the APM software, it's just the environment and the GPS...but there's a decent discussion here re gps accuracy between 2.8.1 vs 2.9.1.  My…"

"Uploading a log of the last testing where I was able to replicate the problem  I tried watching several times with different graphing going but can't seem to find the source the problem.  It seems like while armed and flying all of…"

"What's your front yard like?  Do you live in Manhattan?  ;)  If a lot of tall concrete buildinds around, that could be a cause (multi-pathing).   I'd suggest try darking everything on it but the bear essentials, APM,…"

"Also, I'm using ferrite chokes (wire just wound through the toroid) on the long wires going from the ESC, 3DR radio, and the camera trigger controller which I have mounted beneath (about 4 -5 inches down from APM/RX)  That…"

"I'll snap a few pics but the general layout is:   APM 2.5  and ublox on the upper front deck of the helicopter (very front of the nose of the chassis on the top of it) Motor is down towards the bottom center as is ESC, it's a…"

"Have any pictures? Long ago, well, a year ago, but that's ancient history for arducopter... ;)  We theorized that the CF blades spinning above the GPS would cause a problem.  But as you say, there's not a lot of real estate…"

"Rob = Guru.   Rob the PPM encoder update made a huge difference.    Next question since you've been spot on all the way:   I've noticed attempts to run away intermittently in position hold and associated with those…"

"Ok, there's this: https://code.google.com/p/arducopter/wiki/APM2Encoder And this code appears like it will fix it if this is the issue? http://www.diydrones.com/profiles/blogs/new-arduppm-firmware-version-2-3-16-in-the-downloads-section "

"Sounds serious, I'll do a seach but any specific pointers to better info on it would be appreciated.  "

"This might be a problem with your Futaba radio not playing nicely with the PPM Encoder.  This is fixable, there's a new firmware for this situation, but I don't know a lot about it.  We'll have to get you some help in…"