{
  "$type": "site.standard.document",
  "description": "To provide a navigation system capable of easily switching between a portable terminal unit and a communication navigation terminal unit with an identical telephone number and also having considered a communication environment. A communication navigation system (100) is comprised of an information…",
  "path": "/patents/1096610",
  "publishedAt": "2003-04-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "G01C21/26",
    "PIONEER CORP [JP]"
  ],
  "textContent": "To provide a navigation system capable of easily switching between a portable terminal unit and a communication navigation terminal unit with an identical telephone number and also having considered a communication environment. A communication navigation system (100) is comprised of an information server unit (110) for controlling communication, a portable terminal unit (120) and a vehicle terminal unit (140) for performing navigation with the information server unit (110), and performs the communication by using a public switched telephone network circuit, and when switching each terminal unit to a communication capable state, it controls a position registration of each terminal unit by performing the communication among the information server unit (110), portable terminal unit (120) and vehicle terminal unit (140) so as to switch the communication capable state.",
  "title": "Communication navigation"
}