Canon EOS-1D X Mark III Advanced User's Manual page 693

Syncing the Time
Preparing the sender camera
First, set up the camera to use as a sender.
1.
On the camera, press the <
2.
Select [
3.
Select [Enable].
4.
Select [Sync time between cameras].
: Network settings].
If the camera is already connected to another device, [Set
[Connection settings] to [Disconnect]] is displayed. Select [OK] to
end the connection.
> button.
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