My GPS is always disabled. Have not ever enable it. More like the battery drainage is caused by my tamron 24-70 VC as suggested by bro ricleo. I come to realize that I did not have this problem before I use the tammy. I only had a canon 50 1.8 when I first got my 6d and battery remain almost full even if I leave that lens attached to the camera for a few days.
Ah, I see....
What has the turned off GPS to do with the Tamron lens?
Nothing to do with the tamron lens, but got to do with the 6D. I read on another website, that particular user is a user of 6D said that the CSC Rep told him that even when the Camera is turned off, the GPS (if turned on) will still continue to consume battery.