Canon EOS 6D Manual De Instrucciones página 196

Setting Time from GPS on the Camera
The camera time can be set using GPS signals.
If the GPS signal cannot be received from five or more satellites, time
setting is not possible. [Set now] will be unavailable.
Even if [Set now] is selected, auto time adjustment may not be possible,
depending on the timing of GPS signal acquisition.
When [Auto time setting] is set to [Auto update], the date or time
cannot be manually set from [Date/Time] setting on the [52] tab.
G-12
Select [GPS].
1
On the [52] tab, select [GPS] and
press <0>.
Set [Select GPS device] to
2
[Internal GPS].
Select [Set up].
3
Select [Auto time setting].
4
Select an option and press <0>.
[Auto update] updates the time after
the camera is turned on and a GPS
signal is received.