"it's in a Quad Copter"

"yup"

"That GPS looks pretty legit. How do you hook it up? I see it comes with UART, I2C and USB.

with the 3DR compass, it uses I2C. Is the GPS port on the 3DR GPS/Compass combo UART? 

Is the accuracy on this really that much better? it says 2m. whitch…"

"I can get to the terminals in both apm planner and mission planner. But even after disconnecting the telemetry radio, I still get the garbage output.
edit: here is a screenshot: http://i.imgur.com/5RRBfJz.png"

"Same thing.

I'm using ArduPilot 3.2. Which I heard removed the Terminal. So.. I wonder how do I do a compass test now? haha"

"Just pinging people's email again. I think I'm almost out of warranty on my system, and I like to figure out the cause. I'm using Ubuntu 14.04 for APM Planner and Windows 7 via VirtualBox for Mission Planner."

"could it be that I have too many logs left on my APM?"

"confirmed. I removed everything from AP_Motors_Quad.cpp that I didn't need.... and it flashed. :-\
What do we do?What do we decide what features go forward with the APM?How do we restrict certain features to the APM or other platforms?"

"i just tried compiling, and I got a verification error:

I posted here so that if others run in to the issue, it's more easily digestible when found on a search engine.
https://github.com/diydrones/ardupilot/issues/1157

I believe, based…"

"It's all good. It took me a while to realize you may have been think A-Shaped VTail (rather than a V-Shaped VTail), like what Flite Test made a video and sells parts for. In my PR, I've added support for both types of Tails. :-)"

"I opened a pull requset for this: https://github.com/diydrones/ardupilot/pull/1148
I think the original swap done by whomever merged in the code was maybe due to thinking the tail was an A rather than a V? idk.

the V is inverted motors. :-)
A is…"

"Motor Mixing in VTail Quad configuration has rear-motors backwards.

We want the motor layout to mimic that of the X-Quad, however, in order to get it to fly, you need to swap the rear motors (2 and 4).
Otherwise it just yaws like crazy."

"FR 1FL 3BR 2BL 4"

"yup, no problem. in the full paramter list, set the FRAME to 4 "

"My Vtail code was pulled in to ArduPilot, and is currently available in master, and ArduPilot 3.2 Beta.

:-)"