# US 2003/0109983 A1 · Communication navigation system, communication navigation method, route guidance information transmitting device, and terminal unit > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2003/0109983 A1 - Document ID: US20030109983A1 - Status: Published application - Kind: A1 - Application number: 10/264,342 - Filed: 2002-10-04 - Published: 2003-06-12 - Earliest claimed: 2001-10-05 - Assignees: Pioneer Corporation; Increment P Corporation - Inventors: Takashi Takenaga - Web page: https://patentgrep.com/patent/US20030109983A1 ## CPC - G01C 21/34: Route searching; Route guidance - G08G 1/0969: having a display in the form of a map - G01C: MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY (measuring liquid level G01F; radio navigation, determining distance or velocity by use of propagation effects, e.g. Doppler effects, propagation time, of radio waves, analogous arrangements using other waves G01S) - G08G: TRAFFIC CONTROL SYSTEMS (guiding railway traffic, ensuring the safety of railway traffic B61L; arrangement of road signs or traffic signals E01F9/00; radar or analogous systems, sonar systems, lidar systems specially adapted for traffic control G01S13/91, G01S15/88, G01S17/88; {radar or analogous systems, sonar systems, lidar systems specially adapted for anti-collision purposes G01S13/93, G01S15/93, G01S17/93}) ## Abstract A communication navigation method comprises a first procedure in which a terminal unit requests a server to transmit an information segment necessary for a first current part of guidance via the Internet, a second procedure in which the server transmits to the terminal unit the information segment requested by the first procedure, via the Internet, a third procedure in which after the second procedure, the terminal unit requests the server to transmit an information segment necessary for a second current part of the guidance via the Internet, and a fourth procedure in which the server transmits to the terminal unit the information segment requested by the third procedure, via the Internet. The information segment transmitted by the fourth procedure is an update of the information segment transmitted by the second procedure. ## Claims ### Claim 1 A communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, the communication navigation method comprising: a requesting process in which the navigation terminal requests the server to transmit an information necessary for an immediate part of guidance via the communication network; and a transmitting process in which the server transmits the requested information to the navigation terminal via the communication network, wherein the server transmits updated information to the navigation terminal when the server receives the request from the navigation terminal. ### Claim 2 (depends on 1) The communication navigation method according to claim 1, wherein each of the information segments comprises route information indicative of a route. ### Claim 3 (depends on 1) The communication navigation method according to claim 1, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 4 A communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, the communication navigation method comprising: a first procedure in which the navigation terminal requests the server to transmit an information segment necessary for a first current part of guidance via the communication network; a second procedure in which the server transmits to the navigation terminal the information segment requested by the first procedure, via the communication network; a third procedure in which after the second procedure, the navigation terminal requests the server to transmit an information segment necessary for a second current part of the guidance via the communication network; and a fourth procedure in which the server transmits to the navigation terminal the information segment requested by the third procedure, via the communication, network, wherein the information segment transmitted by the fourth procedure is an update of the information segment transmitted by the second procedure. ### Claim 5 (depends on 4) The communication navigation system according to claim 4, wherein each of the information segments comprises route information indicative of a route. ### Claim 6 (depends on 4) The communication navigation system according to claim 4, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 7 A communication navigation system for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, the communication navigation system comprising: a navigation terminal which requests a server to transmit an information necessary for an immediate part of guidance via the communication network; and a server which transmits the requested information to the navigation terminal via the communication network, wherein the server transmits updated information to the navigation terminal when the server receives the request from the navigation terminal. ### Claim 8 (depends on 7) The communication navigation system according to claim 7, wherein each of the information segments comprises route information indicative of a route. ### Claim 9 (depends on 7) The communication navigation system according to claim 7, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 10 A communication navigation system for implementing a communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, the communication navigation method comprising: a first procedure in which the navigation terminal requests the server to transmit an information segment necessary for a first current part of guidance via the communication network; a second procedure in which the server transmits to the navigation terminal the information segment requested by the first procedure, via the communication network; a third procedure in which after the second procedure, the navigation terminal requests the server to transmit an information segment necessary for a second current part of the guidance via the communication network; and a fourth procedure in which the server transmits to the navigation terminal the information segment requested by the third procedure, via the communication network, wherein the information segment transmitted by the fourth procedure is an update of the information segment transmitted by the second procedure. ### Claim 11 (depends on 10) The communication navigation system according to claim 10, wherein each of the information segments comprises route information indicative of a route. ### Claim 12 (depends on 10) The communication navigation system according to claim 10, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 13 A terminal unit that implements a communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, as the navigation terminal, the communication navigation method comprising: a requesting process in which the navigation terminal requests the server to transmit an information necessary for an immediate part of guidance via the communication network; and a transmitting process in which the server transmits the requested information to the navigation terminal via the communication network, wherein the server transmits updated information to the navigation terminal when the server receives the request from the navigation terminal. ### Claim 14 (depends on 13) The terminal unit according to claim 13, wherein each of the information segments comprises route information indicative of a route. ### Claim 15 (depends on 13) The terminal unit according to claim 13, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 16 A terminal unit that implements a communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, as the navigation terminal, the communication navigation method comprising: a first procedure in which the navigation terminal requests the server to transmit an information segment necessary for a first current part of guidance via the communication network; a second procedure in which the server transmits to the navigation terminal the information segment requested by the first procedure, via the communication network; a third procedure in which after the second procedure, the navigation terminal requests the server to transmit an information segment necessary for a second current part of the guidance via the communication network; and a fourth procedure in which the server transmits to the navigation terminal the information segment requested by the third procedure, via the communication network, wherein the information segment transmitted by the fourth procedure is an update of the information segment transmitted by the second procedure. ### Claim 17 (depends on 16) The terminal unit according to claim 16, wherein each of the information segments comprises route information indicative of a route. ### Claim 18 (depends on 16) The terminal unit according to claim 16, wherein each of the information segments comprises guidance information used to implement the guidance. ### Claim 19 A navigation terminal unit that implements a communication navigation method for performing navigation, using map data stored in a server and current position data about a navigation terminal, by transmitting the map data to the navigation terminal via a communication network, wherein the server transmits an information necessary for an immediate part of guidance requested from the navigation terminal to the navigation terminal via the communication network, and the navigation terminal requests the server to transmit an information necessary for an immediate part of guidance via the communication network. ### Claim 20 (depends on 19) The terminal unit according to claim 19, wherein each of the information segments comprises route information indicative of a route. ### Claim 21 (depends on 19) The terminal unit according to claim 19, wherein each of the information segments comprises guidance information used to implement the guidance.