In surveying, a pole is bar made of wood or metal and normally held vertical, upon which different instruments can be mounted: a

prism Prism usually refers to: * Prism (optics), a transparent optical component with flat surfaces that refract light * Prism (geometry), a kind of polyhedron Prism may also refer to: Science and mathematics * Prism (geology), a type of sedimentary ...

, a

GPS device A satellite navigation device (satnav device) is a user equipment that uses one or more of several global navigation satellite systems (GNSS) to calculate the device's geographical position and provide navigational advice. Depending on the ...

, etc. It may be manufactured with a predetermined length (e.g., 2 meters) or may be graduated for different heights or stages. Technology advances have introduced tilt-compensation capability into survey poles, that allow the surveyor to measure points above ground or when the pole is off-vertical.

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