The number of GLONASS satellites with global visibility at any location is shown in Fig. GLONASS Number of Visible Satellites. Different colors represent different levels of satellite visibility (See the legend on the right).
Fig. GLONASS Number of Visible Satellites
The computation of GNSS positioning requires three location parameters and one clock offset parameter, so at least four satellites need to be in view of the receiver simultaneously (positioning accuracy is also related to many other factors). The approximate coverage area of GLONASS is also illustrated in Fig. GLONASS Number of Visible Satellites.
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