Navigation control for an electronic device

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for suggesting search queries relevant to a user's context. One of the methods includes providing a navigation control for navigating in a graphical space. A portion of a large-scale graphical space is displayed on a screen of an electronic device and a navigation control is generated and displayed on the screen. The navigation control includes a ring-shaped graphical entity and a knob graphical entity positioned at point on the ring-shaped graphical entity. A zooming user input can be received to the navigation control, and in response, zooming in the graphical space is provided. The zooming user input includes the user selecting the knob graphical entity and tracing a shape of the ring-shaped graphical entity with the knob graphical entity in either a first direction to zoom in or in a second direction to zoom out.