Electronic watch and method of correcting time difference

An electronic watch comprising:

• a timekeeping circuit configured to keep time;
• a first receiver configured to receive a standard radio wave containing time information;
• a first time correction unit configured to correct the time using the time information contained in the standard radio wave received by the first receiver;
• a beacon communication circuit comprising a second receiver, separate from the first receiver, configured to receive a beacon signal containing beacon identification information transmitted from a ground-based radio station;
• a storage unit configured to store a plurality of pieces of the beacon identification information as received in the beacon signal by the second receiver and a plurality of pieces of time difference information corresponding to the plurality of pieces of beacon identification information;
• a second time correction unit configured to correct the time using the time difference information corresponding to the beacon identification information of the beacon signal received by the second receiver among the plurality of pieces of time difference information stored in the storage unit;
• and
• an operation device configured to accept a reception instruction of the beacon signal, wherein
• the second receiver is configured to receive the beacon signal when the operation device accepts the reception instruction.

A method of correcting a time difference, performed by an electronic watch including a timekeeping circuit configured to keep time, a storage unit configured to store a plurality of pieces of beacon identification information as received in a beacon signal and a plurality of pieces of time difference information corresponding to the plurality of pieces of beacon identification information, and an operation device, the method comprising:

• receiving, using a first receiver, a satellite signal containing time information;
• correcting the time using the time information when the satellite signal is received;
• receiving, from a ground-based radio station using a beacon communication circuit comprising a second receiver separate from the first receiver, the beacon signal when the operation device accepts a reception instruction of the beacon signal containing the beacon identification information;
• and
• correcting the time using the time difference information corresponding to the beacon identification information of the beacon signal among the plurality of pieces of time difference information stored in the storage unit when the beacon signal is received.