Patent ID: 8878872

Claim:
A system for generating an overlay of navigation chart information, said system comprising: a source of pilot input data; a source of navigation chart data; and a chart generator configured to establish an image data set comprised of first data representative of an image of first navigation chart information, where the first data has been retrieved from the source of navigation chart data by a first retrieval operation, and the image of first navigation chart information is comprised of an exact copy of information and appearance as shown on a first printed navigation chart, where the first printed navigation chart is printed to a first scale; receive first input data through the source of pilot input data, where the first input data is representative of a visible input shape comprised of boundaries and defined by screen coordinates; define a geographical region falling within the boundaries of the visible input shape; and update the image data set with second data representative of an overlay of second navigation chart information, where the second data has been retrieved from the source of navigation chart data by a second retrieval operation, where the second navigation chart information is comprised of information falling within the geographic region and is other than the first navigation chart information, and the second retrieval operation is a retrieval operation other than the first retrieval operation, and the overlay of second navigation chart information is comprised of an exact copy of information and appearance as shown on a second printed navigation chart, where the second printed navigation chart is printed to a second scale, and the second scale is a scale other than the first scale, such that the overlay blocks all underlying first fixed visual information from view at a screen location of the visible input shape, and the initial shape of the overlay is the same as the visible input shape.