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M4 WR
Recalibrating the altitude before starting
Why is it necessary to recalibrate the M4?
The M4 measures the current air pressure and converts
it into an altitude measurement. The air pressure changes
daily depending on the weather. This leads to a constantly
changing current altitude measurement
HOWEVER: your home start altitude has not changed.
During recalibration, the currently measured air pressure is
recalculated on the basis of a reference value – the preset
start altitude for your home.
Following recalibration, the M4 again correctly displays the
start altitude as the current altitude.
To calibrate the cycle computer, press and hold the
ALTI button until the menu opens.
Altitude SELECT” flashes on the display.
You can now choose whether you want to:
set the current altitude to the correct value
set the current sea level pressure to the correct value
use the start altitude 1 as the reference value for the
recalibration
use the start altitude 2 as the reference value for the
recalibration
Press the BIKE or ALTI button to scroll to Home Alti 1 or
Home Alti 2 depending on where you are setting off from.
Press the SET button to confirm the desired start altitude.
The M4 now stores the preset values and displays the start
altitude as the current altitude at your present location.
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