No , sir I don't have it , pls look at the pictures and tell me is the compass inverted or not .

I figured it out , it's reversed , I'm installing beta firmware right now

New problem , the motors rotate when I arm the quad but they don't respond much to the throttle stick movement . Pls help .

I have already recalibrated everything

Have you flown the quad? In which flight mode the throttle is less responsive?

It's not working in any mode , therefore I haven't flown it yet .

Today I flew my APM quad with firmware 3.2 rc7. I didn't notice any issues with throttle. New Position Hold (Hybrid) mode works great. Posted a vid & sorry for the crappy video, it was taken with a mobile phone.

Wouldn't an EMI shield over the GPS minimize the interference?

I exactly faced the same situation three reasons that can cause this
1. Vibration - caused by unbalanced props put some vibration dampening to see if its under level check the log ACCX ACCY ACCZ values should be below 3 , 3, 15
2. Compass- RE-DO Live calibration and check the magnetic declination of your area put the values in after checking the values online
moreover COMPASS-Motor calibration is extremely important make sure they are not more than 35 -40 percent if interference  is more try isolating the compass use a mounting to elevate it from the motors so that magnetic interference is less
3. PIDs see is the PID of stabilize mode and LOITER is good moreover check if you have 3D lock before switching to loiter