Hello. i have been flying my Phantom 2 for quite a while now (2 months at least) and decided to turn on the Naza M mode. so i activated it on the software assistant and all seems to be well. i tried to turn on the IOC. but when i click the check box nothing happens. the left switch (X2) doesnt change any settings and i cant see any changes in the software assisnt when i go back to the basic menu. it still says IOC is off.
is there another step im missing? please let me know.

did you press enter after you checked the box.?

Make sure your GPS Module is connected well.
Has the X2 channel been occupied?

Up at the top right, do you see Phantom or NAZA-M button?  If Phantom, you must click that and change to NAZA and then go back and click the IOC box.

Also, IOC might not activate if the FC senses compass or IMU errors.
If none of the above solutions help, try doing a compass calibration (360 degree dance) and an advanced IMU calibration before trying to check the IOC box again...

T J Gilbert Posted at 2014-12-16 00:09
Also, IOC might not activate if the FC senses compass or IMU errors.
If none of the above solutions  ...

Did you switch off your Phantom 2 and on again after switching to NAZA ?

Happy Landings

i figured it out. it seemed to be a GPS calibration issue due to being to close to my PC. soon as i found a longer cord and moved it away it magically started working. thanks for your replies.
going for a first flight today. wish me luck!

that makes no sence, you dont calibrate the gps?

i took it out for a test fly today and it seem to fly well. all modes seemed to work. HL worked by pushing down on the right stick so that was good. ATT mode worked as it started to drift when i took it out of GPS lock. and stopped in place when i turned it back on.
only thing that didnt work was the CL mode.
what exactly is this mode suppose to do? how is the copter suppose to act?
here is a picture of my copter

CL is like flying along a road next to a car.  You can rotate the Phantom to follow the car as you pass it, but not change your course of flight.