| 摘要 |
PROBLEM TO BE SOLVED: To enable the indication of a map color and sky atmosphere color corresponding to the time change of natural atmosphere colors on a display. SOLUTION: A sun-relative bearing-time calculator 2 computes the sunrise and sunset times To, Ti, based on a present position (X, Y) and present time T or a moving body measured by a present position-time measuring unit 1, an indication color calculator 3 gradually change the indication colors of a map and sky background shown on a display 6, the sun-relative bearing-time calculator 2 computes the absolute bearingsθo,θi in the sun orbital plane at the sunrise and sunset times To, Ti, the background indication color shown in the display 6 is bright in the direction of the sun and dark in the opposite direction thereto, and hence the moving body can be comfortably guided and run, with visually feeling the image of the natural atmosphere on the display 6. |
