A GPS wristwatch has a reception mode setting unit that sets a reception mode of a reception unit; and a locking level setting unit that sets a locking performance. The reception mode setting unit sets the reception mode to an automated timekeeping mode when an automated reception condition is met; sets the reception mode to a manual timekeeping mode when a first operation of an input unit is detected; and sets the reception mode to a positioning mode when a second operation of the input unit is detected. The locking level setting unit sets the locking performance to a high level when the reception mode is set to the manual timekeeping mode or the positioning mode, and sets the locking performance to a low level that is lower than the high level when the reception mode is set to the automated timekeeping mode.