Canon WFT-E4 Instruction Manual page 78

Connecting GPS Devices
Unplugging GPS Devices from the USB Port
Before unplugging GPS devices from the USB port, always select [Disconnect] as shown in
step 5. Follow the instructions displayed to terminate the connection.
The connection will not be terminated if you simply turn off the camera and GPS device. If you
unplug GPS device while the connection is still active, plug the GPS device into the USB port
again and follow the preceding steps to terminate the connection.
Power Management
78
If you will not use a wireless or wired LAN at the
same time as the GPS device, set
[Communication mode] to [Disconnect]. The
camera battery drains faster under settings other
than [Disconnect] because power saving is
disabled.