Time zone and date
setup menu

enter or correct time & date

Language
setup menu

choose the language for menus

Clean image sensor
setup menu

defines when the D5100 performs an automatic cleaning of the image sensor

Lock mirror up for cleaning
setup menu

flips up the mirror and allows access to the image sensor for cleaning

Image dust off ref photo
setup menu

creates a reference photo that the Nikon software „Capture“ can use to remove dust spots from images

GPS
setup menu

defines when the optional GPS receiver will be switched off and allows to get the current longitude and latitude

Firmware version
setup menu

shows the current version of the camera’s internal software

Reset shooting menu    shooting menu
Reset custom settings    custom setting menu

resets the shooting menu / custom setting menu back to default values defined by Nikon