{
  "$type": "site.standard.document",
  "description": "A navigation apparatus is provided with: a first storing device (33, 34, 36, 24) for storing original data for a navigation based on a predetermined format and including map data, in such a manner that an empty area exists on the predetermined format in each processing unit for a predetermined kind…",
  "path": "/patents/1086122",
  "publishedAt": "2004-06-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/3815",
    "PIONEER CORP [JP]"
  ],
  "textContent": "A navigation apparatus is provided with: a first storing device (33, 34, 36, 24) for storing original data for a navigation based on a predetermined format and including map data, in such a manner that an empty area exists on the predetermined format in each processing unit for a predetermined kind of navigation processing; a second storing device (33, 34, 36, 24) for storing difference update data representing a data portion for the navigation that is updated with respect to the original data as a standard; and a re-writing device (20) for generating updated data based on the format and including the original data and merge data, by re-writing the merge data at least partially into the empty area corresponding to the merge data. The merge data defines a relationship of the difference update data with respect to the original data. The navigation apparatus is also provided with a processing device (20) performing the navigation processing on the basis of the original data and the difference update data.",
  "title": "Navigation apparatus and method, and computer program"
}