# US 11,442,179 B2 · Electronic timepiece > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,179 B2 - Document ID: US11442179B2 - Status: Granted - Kind: B2 - Application number: 16/784,472 - Filed: 2020-02-07 - Published: 2020-06-04 - Granted: 2022-09-13 - Earliest claimed: 2016-03-28 - Assignees: Seiko Epson Corporation - Applicants: Seiko Epson Corporation - Inventors: Toshiyuki Nozawa - Web page: https://patentgrep.com/patent/US11442179B2 ## CPC - G01S 19/45: by combining measurements of signals from the satellite radio beacon positioning system with a supplementary measurement - G01S 19/26: involving a sensor measurement for aiding acquisition or tracking - G01S 19/48: by combining or switching between position solutions derived from the satellite radio beacon positioning system and position solutions derived from a further system - G01C 21/20: Instruments for performing navigational calculations (G01C21/24, G01C21/26 take precedence) - G01S 19/14: specially adapted for specific applications - G01S 19/34: Power consumption - G04G 21/04: using radio waves (radio-controlled time-pieces G04R) - G04R 20/04: Tuning or receiving; Circuits therefor - G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES - 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) - G04G: ELECTRONIC TIME-PIECES - G04R: RADIO-CONTROLLED TIME-PIECES ## Abstract An electronic timepiece is provided that executes navigation to a destination site. The timepiece includes a display unit, a magnetic sensor, a reception unit that receives time information indicating a time from a GPS satellite, a storage unit that stores orbit information indicating an orbit of the GPS satellite, and a control unit that generates positional information indicating a position of the electronic timepiece using the time information received by the reception unit and the orbit information stored in the storage unit and executes the navigation using the display unit based on the positional information, an output of the magnetic sensor, and destination site information indicating a position of the destination site. When the orbit information is stored in the storage unit and then a first predetermined time equal to or less than a valid period of the orbit information elapses, the control unit updates the orbit information stored in the storage unit. ## Claims ### Claim 1 An electronic timepiece that executes navigation to a destination site, comprising: a display unit; a magnetic sensor; a reception unit configured to receive time information indicating a time from a GPS satellite; a storage unit that stores orbit information indicating an orbit of the GPS satellite; and a control unit configured to generate positional information indicating a position of the electronic timepiece using the time information received by the reception unit and the orbit information stored in the storage unit and execute the navigation using the display unit based on the positional information, an output of the magnetic sensor, and destination site information indicating a position of the destination site, wherein when the orbit information is stored in the storage unit and then a first predetermined time equal to or less than a valid period of the orbit information elapses, the control unit updates the orbit information stored in the storage unit. ### Claim 2 (depends on 1) The electronic timepiece according to claim 1, further comprising: a first manipulation unit configured to receive a first manipulation of giving an instruction to start the navigation, wherein when the first manipulation unit receives the first manipulation, the control unit is configured to receive the time information from the GPS satellite using the reception unit, generate the positional information using the time information and the orbit information stored in the storage unit, and execute the navigation using the display unit based on the positional information, the output of the magnetic sensor, and the destination site information. ### Claim 3 (depends on 2) The electronic timepiece according to claim 2, wherein in a case in which an elapsed time until the orbit information is stored in the storage unit and then the first manipulation unit receives the first manipulation exceeds a second predetermined time shorter than the first predetermined time, the control unit is configured to receive the orbit information from the GPS satellite using the reception unit according to the first manipulation and update the orbit information stored in the storage unit to the orbit information received according to the first manipulation. ### Claim 4 (depends on 3) The electronic timepiece according to claim 3, wherein in a case in which the elapsed time exceeds the second predetermined time, the control unit is configured to stop a reception operation of the reception unit when the orbit information is not receivable despite elapse of a third predetermined time after the reception unit starts the reception operation. ### Claim 5 (depends on 4) The electronic timepiece according to claim 4, wherein the orbit information and the time information are included in a navigation message included in a satellite signal transmitted from the GPS satellite, and wherein the third predetermined time is shorter than a transmission period of the navigation message. ### Claim 6 (depends on 3) The electronic timepiece according to claim 3, wherein in a case in which the elapsed time does not exceed the second predetermined time, the control unit is configured to stop a reception operation of the reception unit when the time information is received according to the first manipulation. ### Claim 7 (depends on 1) The electronic timepiece according to claim 1, further comprising: a second manipulation unit configured to receive a second manipulation of giving an instruction to generate the destination site information, wherein when the second manipulation unit receives the second manipulation, the control unit is configured to receive the time information and the orbit information from the GPS satellite using the reception unit, update the orbit information stored in the storage unit to the orbit information received according to the second manipulation, and generate the positional information as the destination site information using the time information received according to the second manipulation and the updated orbit information stored in the storage unit. ### Claim 8 (depends on 1) The electronic timepiece according to claim 1, wherein the orbit information is ephemeris data.