Making precise measurements
In the following situations, complete GPS positioning, display the measurement screen, and then wait outside for at
least 15 minutes with no obstructions overhead. This allows you to make precise measurements.
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When you use the device for the first time after purchase
❏
When the device has not been used for several months
You need not make these preparations from the second time.
Note:
The basic configuration of the GPS system is 24 satellites orbiting the Earth at an altitude of 20,000 km, with at least four
satellites travelling in six different orbits. The GPS receiver acquires data from four satellites and calculates the latitude,
longitude, altitude, and time. Measuring can start once positioning has been performed and this information has been
received. Since you can receive more detailed GPS navigation data (satellite orbital information) after 15 minutes from this
point, you can make more precise measurements.
However, errors may occur in distance measurements, even after waiting 15 minutes or more, due to atmospheric conditions
and the usage environment.
SF-810 User Manual
Preparing and Basic Operations
33
