Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 215)

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To acquire GPS signals, take the camera outside where the sky is
unobstructed. Face the top of the camera toward the sky while keeping
your hands, etc., away from the camera top.
When the signal acquisition conditions are good, it will take the camera
approx. 30 sec. to 60 sec. to acquire the GPS satellite signals after you
set [
GPS ] to [ Mode 1 ] or [ Mode 2 ]. Check that [ r ] is displayed on
the rear LCD panel, then shoot.
1
Select [GPS settings].
Under the [ 5 3 ] tab, select [ GPS
settings ], then press < 0 >.
2
Select the mode.
Select [ Mode 1 ] or [ Mode 2 ].
X [ r ] will be displayed on the rear
LCD panel.
Mode 1
The camera will continue to receive GPS signals at regular intervals
even when the power switch is set to <
1 > or < 2 >.
Mode 2
When the power switch is set to < 1 >, the camera will receive
GPS signals. When the power switch is set to < 2 >, the GPS
function will also turn off. However, if auto power off is in effect, the
camera will continue to receive GPS signals at regular intervals.
Acquiring GPS Signals
If the GPS signal cannot be acquired, the image can be geotagged with the
location information last acquired (p.221).