Nikon D300S User Manual page 226

The k Icon
When the camera establishes
communication with a GPS device, a k icon
will be displayed in the control panel. Photo
information for pictures taken while the k
icon is displayed will include a page of GPS data (0 214). GPS data
are only recorded when the k icon is displayed; confirm that the k
icon is displayed in the control panel before shooting (a flashing k
icon indicates that the GPS device is searching for a signal; pictures
taken while the k icon is flashing will not include GPS data). If no
data are received from the GPS unit for two seconds, the k icon
will clear from the display and the camera will stop recording GPS
information.
t
200