Nikon D6 Reference Manual page 59

D
The GNSS Antenna
If possible, stay in the open when using location data services. Keep the
antenna pointed to the sky for best reception.
D
The Connector Covers
Be sure to close the covers when the connectors are not in use. Foreign
matter in the connectors could cause malfunction.
D
The Speaker
Close proximity to the speaker could corrupt data stored on magnetic
stripe cards or other such magnetic storage devices. Keep magnetic
storage devices away from the speaker.
A
The Security Slot
The security slot serves as an attachment point
for third-party anti-theft cables. It is compatible
and intended for use with Kensington security
cable locks. For more information, see the
documentation provided with the security
cable lock.
Parts of the Camera
7