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Related Terms

SLIDE BEARING

A bearing used or positioning a slide or for axial alignment of a long rotating shaft.

INTEGRATED NAVIGATION SYSTEM

A navigation system which comprises two or more positioning systems combined in such manner as to achieve performance better than each constituent system.

RTG

Traveling crane used for the movement and positioning of containers in a container field. RTG's may also be used for loading and unloading containers from rail cars.

RUBBER-TIRED GANTRY

Traveling crane used for the movement and positioning of containers in a container field. RTG's may also be used for loading and unloading containers from rail cars.

ABSOLUTE ACCURACY

The ability of a navigation or positioning system to define an exact location in relation to a coordinate system.

NAVY NAVIGATION SATELLITE SYSTEM

A satellite navigation system of the United States conceived and developed by the Applied Physics Laboratory of the Johns Hopkins University. It is an all-weather, worldwide, and passive system which provides two-dimensional positioning from low-altitude satellites in near-polar orbits. The Transit launch program ended in 1988, and the system is scheduled for termination in 1996, replaced by GPS.

LONG RANGE SYSTEMS

Radionavigation systems providing positioning capability on the high seas.

MEDIUM RANGE SYSTEMS

Those radionavigation systems providing positioning capability beyond the range of short range systems, but their use is generally limited to ranges permitting reliable positioning for about 1 day prior to making landfall; Decca is an example.

DGPS

GPS

Global Positioning System (see GNSS)
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