Canon EOS-1D X Mark III Advanced User's Manual page 702

GPS Logger
By setting [Log GPS position] to [Enable], you can automatically record geotag information
at specific intervals along the route that the camera travels. Geotag information is recorded
at the interval set in [Position update intvl] as log data saved in the camera's internal
memory by date. You can also view the route traveled on a map displayed on a computer.
Position update intervals and log data capacity (in days) are as follows.
Update Interval
Every sec.
Every 5 sec.
Every 10 sec.
Every 15 sec.
* With one day being equivalent to eight hours of log data
Names of daily log files consist of the date and number (such as 19101000). New log file
are created if the camera enters a new time zone (
When the camera's internal memory becomes full, old log data is overwritten with new
data.
Caution
In [Mode 1], GPS logging continues even with the power switch set to <
In [Mode 2], setting the power switch to <
However, GPS logging continues during auto power off.
Geotag information added to images may be inaccurate under some traveling
conditions, in some locations, or under some GPS settings.
Log Data
4.1 days
20 days
41 days
61 days
702
Update Interval
Every 30 sec.
Every min.
Every 2 min.
Every 5 min.
).
> deactivates GPS logging.
(Approx.)
Log Data
100 days
100 days
100 days
100 days
>.