B52 Geo43 User Manual - page 26
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Language Selection: Selection would be effected only after the device is restarted.
Calibrate the Touch Screen
For the first time use of the GPS device or after it’s used for a long time, the user can enter
the screen calibration to reset it. In order to keep high accuracy, please use stylus to
calibrate and follow the instructions. Touch any place on screen to exit when finished.