The VX Log hardware includes a high precision GPS chip made in Europe. VX Log monitors operate using the US GPS satellites, as well as BeiDou, QZSS, Galileo and Glonass where needed, and will use SBAS enhanced broadcasts in countries where this is available (EU and US).
The GPS system is latest generation and includes very fast lock times to lock onto satellites (typically in less than 1 minute). The GPS chip in the VX Log can determine a position with 3 satellites and will normally give reliable information if 4 or more satellites are detected. The chip calculates speed and position 10 times each second.
There are several factors that can affect GPS performance with the VX Log™ monitor:
The user must set the sport correctly in the VX Log™ before use.
There is some variation in GPS reception quality throughout the day.
The VX Log may have reduced positional accuracy if it is used under significant tree cover.
The VX Log will have reduced positional and speed accuracy if used in locations with buildings shadowing the user from a good view of the sky and horizon. This may be noticeable when using the VX Log in a stadium with very high stands on all sides.
Note: For Northern Hemisphere use most satellites are seen in the south, east and west of the sky.
For Southern Hemisphere use most satellites are seen in the north, east and west of the sky.
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