Canon EOS 6D Instruction Manual page 46

Logging the Route Traveled
When carrying the camera in a bag or suitcase as you travel, make sure
the camera faces upward and nothing is on top of it.
Set the camera time and date as accurately as possible. Also, set
appropriate time zone and daylight saving time for the shooting location.
When using the Map Utility software, images are geotagged by
comparing image date/time tags to logged date and time information. An
incorrect date and time setting may prevent accurate geotagging.
Since location information, date, and time are constantly recorded, the
battery is consumed even when the camera is turned off. Therefore, the
battery level may already be low when the camera is used. Charge the
battery when necessary or prepare a charged spare battery (sold
separately).
When you shoot while using the GPS logging function, images taken will
be geotagged. The recorded location information can be viewed on a
virtual map on a computer using the Map Utility software.
It is also possible to add location information at a later time to images
shot by other EOS cameras and Canon compact digital cameras
travelled with this camera using the Map Utility software. This function is
applicable to JPEG and RAW images (file extension: CR2).
Movie files can also be geotagged this way at a later time, when using
cameras that display [GPS device settings] in the menu (except with
the EOS 7D).
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