a building or under a concrete
roof. The signal may be blocked
or diverted even if the tracker is
placed near a window. In such
cases the device will use an
alternative method to calculate
its position. The position is deter-
mined through identification of
a nearby WiFi router or mobile
communications antenna. This is
less precise than GPS data, and
may be hundreds of metres from
the tracker. If the device is using a
cell-based location (also known as
“GSM-based location”), you will be
able to tell by a semi-transparent
blue circle over the location.
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