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(Redirected from Altimeters)
Types of equipment
As altitude increases, barometric pressure decreases, by about one millibar for every 27 feet when in relative proximity to sea level. If the pressure has been set at a known height any deviation from this height can be calculated from the change in pressure.
These work on the basis of triangulation, however, more then 3 satellites are required and so is only restricted to top end GPS units for any true accuracy. Most GPS units work off barometric pressure.