BMW C 650 GT Rider's Manual page 137

Pivot navigation device 1
forward and at the top
edge, press it into latching
mechanism 3.
The navigation device engages.
Check that the navigation
device is secure in the cradle.
The red release mark is not
visible.
https://www.motorcycle-manual.com/
Removing navigation
device
Press release 2.
Red mark 3 indicates that latch
is released.
Remove navigation device 1.
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