To provide an exercise monitoring system, an exercise monitoring method, a program, and an exercise monitoring device with which it is possible to start measurement without keeping a user waiting.SOLUTION: A wearable apparatus 200 of an exercise monitoring system includes an observation data generation unit 64 for generating satellite signal observation data, and a first processing unit 67 for determining whether a prescribed number or larger number of positioning satellites have been captured, and when the prescribed number or larger number of positioning satellites are captured, causing observation data to be stored in association with a received time of day at which a satellite signal is received. An information processing device 400 includes a second processing unit 230 for acquiring the received time of day and the observation data, acquiring past satellite orbit information corresponding to the received time of day, and determining calculation position information at the received time of day using the observation data and the past satellite orbit information.SELECTED DRAWING: Figure 5
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