Chart management method for portable airborne navigation system

The invention relates to a chart management method for a portable airborne navigation system. The chart management method comprises the following steps: acquiring chart coordinates calibration; completing aircraft locating; layering and dividing the chart to obtain chart subgraphs; arranging focus information for displaying the position of the aircraft in the navigation system; determining the focus subgraph index of the subgraphs in which the aircraft locates; realizing the chart background initializing display of the navigation system; translating and rotating the background chart of the navigation system; carrying out chart zooming on system background aviation according to the zooming operation of a user, and other steps. The chart management method adopts a standard chart as the background of the airborne navigation system, and the chart is layered and divided in a quad-tree manner under the condition of the restricted memory space; by effectively indexing and invoking aviation, loading, translating, rotating, zooming and the like can be carried out on the chart by the navigation system, so that the problem that the chart takes up the internal efficiency is effectively solved.