boundary marker(redirected from Boundary stone)
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boundary marker[′bau̇n·drē ‚mär·kər]
A radio transmitter operating at 75 megahertz and installed near the approach end of landing runway (3.9 nautical miles ± 1000 feet, or 7123 ± 305 meters) and approximately on the localizer course line.
May consist of a wooden stake, surveyor’s marker, or monument located at the points where the perimeter changes directions, as indicated on a plot
A marker or inscribed stone that designates some type of boundary; for example, see meridian stone.
A painted object, such as a cone, disc, or other devices, used to mark the boundary of the surface usable for landing and takeoff of aircraft. The landing area may not have any boundary lights.