| 摘要 |
PURPOSE:To improve the handling by providing a recording means with data on whether there is an adjacent map or not and on an enlarged map in addition to standard map data which is displayed normally, and selecting the standard map or enlarged map with an operation switch. CONSTITUTION:An operator retrieves the number of a map including the current position in a prepared atlas and changes numbers displayed on a CRT by using keys 206-209. Thus, the map number retrieved in the atlas is made coincident with the map number displayed on the CRT116 and the operator then presses a setting key 202. Consequently, an MPU101 searches for the corresponding map on a cassette tape 105 through a CMTC106 to store road map data in memories 111, 112, and 113 through a multiplexer 110 and also display them on the CRT 116. Then, cursor data is read in a memory 114 from a ROM108 and displayed on the display screen, and the map is enlarged with an enlargement key 204 to retrieve a target position. |
