Nikon D3body D3 User's Manual - Page 359

Option u Virtual horizon * None (default) Description The electronic analog exposure displays act as a tilt meter (pg. 333). No operation is performed when the Fn button is pressed. * This option can not be used in combination with [FUNC. button+dials] (pg. 334). Selecting this options displays a message and sets [FUNC. button+dials] to [None]. If another option is selected for [FUNC. button+dials] while this setting is active, [FUNC. button press] will be set to [None]. A Virtual Horizon When [Virtual horizon] is selected for [FUNC. button press], the electronic analog exposure displays in the viewfinder and top control panel act as a horizontal level when the Fn button is pressed. Camera tilted right Camera level Camera tilted left Control panel Viewfinder Note that the display may not be accurate when the camera is tilted at a sharp angle forward or back. U 333