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If the device does transmit on Sigfox but there are no positions sent at the same time, this may be due to several phenomena specific to devices using satellite positioning systems.
The main position losses come from the stalling of the signals between the device and the satellites, thus preventing the triangulation of the position:
– From GPS fix just after departure, cold, where the device could no longer see the constellation of the satellites, and therefore needs about 3 minutes before starting to move to find their position and thus start to fix its position correctly.
– From the outside environment: trees, buildings and even clouds can prevent the proper reception of data from a satellite and can cause triangulation to be prevented or accuracy to be lost.