Suunto T4D User Manual page 38

TIP: The GPS POD is listed in the menu, but the calibration has no effect on
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CALIBRATE
the GPS POD. Use this calibration setting if you have, for example, two Bike PODs for different
bikes. You can pair one of them as GPS POD and use the calibration in the same way as you
normally would with a Bike POD.
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