User's Manual

4.2 Onshore GPS
Outdoor sports: GPS positioning shall be completed before running, cycling, swimming, and
ski/boarding, performing sports without GPS positioning will affect the accuracy of logging
and calories.
When the GPS signal is interrupted, the GPS LOSS alarm will appear until the signal is
re-received.
Factors that affect GPS positioning:
GPS signals are positioned through electromagnetic waves. When obstacles are
encountered, signal reception will be affected, so positioning cannot be guaranteed.
The following are common disturbances:
* High-rise buildings: With cement wall of high-rise buildings and alleys on both sides, the
signal received will be relatively less.
* Forest roads: Dense leaves and branches act as concrete walls, which will reduce the
penetration of GPS electromagnetic waves.
* Adjacent to high-voltage towers: As electromagnetic waves of different frequencies will be
generated during the transmission and distribution of high-voltage towers, which will
interfere with the GPS signal reception.
* Base station electromagnetic waves
* Cloudy days & air pollution: thick clouds, water vapor in the clouds and metal components
in air pollution may affect the GPS signal reception.