"I don't think you'll get nearly the precision you're looking for, especially since you need absolute positioning, not relative. If I were you I'd look at a kinect (I heard that there is a smaller version available). Good luck!

M."

"For dual GPS being only informational at this point check 9b on top of the post as Phill says.

OK, then there are a few more things to check.
  - if it's a plane, check the parameter that gives you the "tolerance" in hitting the waypoint. If it's…"

"Rai,

what do you have after in the mission plan the third waypoint? If it's the last one, that's what it is supposed to happen. It should enter loiter (which if you have a plane it will be circling).

Regarding dual GPS I understand that it's…"

"Rainer,

I only see a big climb followed by a gentle descent. There is a crash error message, but only after it reaches down (safely?). Maybe the wrong log?

Mihai"

"Looks a lot like my crashes on RTL earlier - any idea how to unpack the bin log to a dataflash type of log so I can have a look?
http://diydrones.com/forum/topics/loiter-and-rtl-crashing-bug
It may not be the same, but it doesn't hurt checking -…"

"I'm answering your question below (for some reason it doesn't let me answer the question under the question). My tune was done manually, as autotune was apparently enough to trigger the motors shut-down bug. Now that it has been solved, I may very…"

"Jay,
Johnatan said that he's revamping the navigation code for 3.2 - I don't think he'll be chasing bugs until that's done (as far as I understand).
All the best,
Mihai"

"Thanks Randy,
I appreciate that you don't let it "slip". I'll be keeping an eye on it after 3.2 is released too. In the mean time I'll disable the climbing phase. Tonight I thought I saw a twitch in the descending phase. Since it's first time that I…"

"Ah - I didn't know - navigation was just reworked in 3.0.1 and I assume that it will stay like that for a while at least - I like quite a bit the way it works (I tried 2.9 and didn't like it), so I'm surprised to hear you're revamping. As far as I…"

"I know Jay. There were two bugs:
  - first causes instability (the twitch) on RTL in the climbing phase
  - the second one causes the motors to lock down on large throttle/roll inputs
Patch 3.1.3 rc1 fixes the second bug, but not the first. That's…"

"LMAO - I know it twitches - see here the consequence if you couple that twitch with a nasty stability bug (just fixed this past Sunday):
http://www.diydrones.com/forum/topics/loiter-and-rtl-crashing-bug
Johnatan/Leonard doesn't believe me it…"

"Ah, thanks - I'm not that far from CG - probably 10-15cm. And the GPS is exactly on top of the APM (as far up as the cable allows it).
Thanks,
Mihai"

"Makes sense. I'll move them.
Thanks,
M."

"Thank you Rainer. As far as I can tell the hardware is working fine - my problems are related to giving a command. Is having the APM centred important (and if yes, why)?
Thanks,
Mihai"

"Is having the APM centred important? I thought a bit about it and I thought that at least the accelerometers ought to show about the same values, and if not calibration would take care of it. I have to say that stability is usually just fine. The…"

"Sure,

it's a bit of a pig - AWU is 2kg (4.4lb). It's a hex X frame, using Turnigy Talon 2.0 carbon fiber frame (super-sturdy BTW - heavy but very strong), with a 3S 5000mAh nanotechnology battery, 800kV motors, 20A Turnigy Plush ESC.
The motors:…"