Runtastic GPS Watch with Heart Rate Measurement, Руководство по эксплуатации

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From time-to-time, Runtastic will update the firmware that runs the
GPS watch in order to improve its performance or update features.
Regularly check for updates when connecting your watch by
clicking on the System tab and pressing the "update" button. You
will be notified if an update is available.
“System”
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Technical data
GPS watch
Power supply: Lithium-polymer battery, 380 mAH, 3,7V
GPS accuracy: 3 meters CEP (50%) under clear sky conditions
The indication of the accuracy is based on the so-called CEP 50%
(Circular Error Probability). This means that in case of very good
GPS reception from the satellites 50% of all measuring points will
be located in a circle with the indicated half-line of 3 m. It also
means that half of the measuring points are outside this half-line.
Further, however, 95% of all measuring points are in a circle with
double half-line. Nearly all points are inside a circle with a half-line
of 6 m, in case of good reception of the satellite.