| 摘要 |
PROBLEM TO BE SOLVED: To provide a track display device capable of reducing the storage amount of track data and performing rational track display and latitude/ longitude display. SOLUTION: This track display device 100 displays the display images of a track L1 and latitude/longitude lines L2 and L3, etc., on a display screen 80a. Each one of position information p1, p4, p7, p10... obtained at every plural intervals (t)×(n) of a time interval (t) is stored in a memory 741 for a present position while being successively updated as present position data 741a. The position information p2, p5, p8, p11... obtained at every plural intervals (t)×(n) for which the time is shifted from the present position data 741a is continuously stored in the memory 74 for the track data as the track data 74b. The position of the present position data 741a of the memory 741 for the present position is positioned in the display screen 80a and the display images of the latitude/ longitude lines L2 and L3 are obtained based on the present position data 741a and latitude/longitude line interval information (h) and (w). The display image of the track L1 is obtained based on the track data 74b of the memory 74 for the track data. |
