Location

coordinates::value - geoposition coodinates. coordinates::accuracy - horizontal accuracy of geopositioning coordinates (DRMS), m. https://en.wikipedia.org/wiki/Circular_error_probable Value range: >= 0.

altitude::value - altitude above the WGS84 reference ellipsoid, m. altitude::accuracy - standard deviation of the altitude measurement error, m. nil means that the platform does not provide this field. https://en.wikipedia.org/wiki/Standard_deviation Value range: (nil, > 0).

course::value - bearing (direction of travel along the Earth's surface. The angle is measured relative to geographic north). course::accuracy - standard deviation of the error of the bearing measurement. nil means that the platform does not provide this field. https://en.wikipedia.org/wiki/Standard_deviation Value range: (nil, > 0).

ground_speed - speed along the Earth surface, m/s. Value range: >= 0. ground_speed::accuracy - mean square deviation of the speed measurement error, m/s. nil means that the platform does not provide this field. https://en.wikipedia.org/wiki/Rayleigh_distribution Value range: (nil, > 0).

Name of the geoposition source.
The timestamps between different geoposition sources are not synchronized, so you cannot compare the timestamps of geopositions that are derived from different sources.

Time point at which the geoposition was determined. This point is not attached to any specific date and is used solely to calculate the time between two geopositioning measurements obtained from one geopositioning source in one session. This field should increase monotonically (even when the system is in sleep mode).