Transport: Air Markers

Flying over unfamiliar U. S. terrain, many a private pilot without directional radio has been reassured, guided or saved from disaster by such terse signs as these, painted in black & orange in 12-ft. letters on the roofs of prominent barns, factories, warehouses, water tanks. Known as "air markers," they are normally visible from 4.000 ft., serve three purposes: 1) to identify the locale; 2) to give the north bearing; 3) to indicate, by a circle, arrow and numeral, the distance and direction of the nearest airport. By last week 58% of the U....

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