General domain of the invention is that the map of aircraft information system indicates, the system includes at least map data base, computer graphical, display equipment and the means for selecting shown map datum ratio. In a system in accordance with the invention, each map datum includes that at least one first symbol associated with the first scale bar of map datum indicates. When selection device selection is greater than or equal to the scale of the first scale, first indicates display on the display device, and when scale of the selection device selection less than the first scale, and first indicates not appearing in display equipment. Each map datum may include that at least one second symbol indicates, which indicates associated with the second scale bar (second scale bar) less than the first scale bar, this depends on map datum, and meet similar display rule.
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