VDO M6.1 Notice D'utilisation Abrégée page 22

Select altitude/recalibrate
Two selectable start altitudes, current altitude can be set in metres/feet or
by means of the sea level pressure.
Recalibration:
Recalibration must occur before every trip.
The M6.1 measures the current air pressure and converts it into an altitude
measurement. However, the air pressure changes daily depending on the
weather. This leads to a constantly changing current altitude measurement
despite your start altitude not having changed.
During recalibration, the currently measured air pressure is calculated back
to the set start altitude. Following recalibration, the current altitude once
again matches the set start altitude.
If you are not setting off from start altitude 1 or 2, you can correct the
current altitude here. This can be done by entering either the altitude in
metres/feet or the sea level pressure.
Details of the sea level pressure can be found on weather websites.
– Press and hold the ALTI button
SET
– Scroll by pressing the BIKE or TPC button
– Make a selection by pressing the SET
TPC BIKE
ALTI
42
button
Settings using the SET button
– Open the settings menu:
Press and hold the SET button until the settings menu opens
– Scroll from Logging to Settings:
Press the BIKE or TPC button
– Open the settings menu: press the SET button
– Scroll to the desired setting in the settings menu:
press the BIKE or TPC button
– Open the settings:
press the SET button
– Change the data:
press the BIKE or TPC button
– Confirm the setting:
press the SET button
– Close the settings menu/back to the function menu:
press and hold the SET button
– Or close the settings menu/back one level:
press and hold the ALTI button
SET
TPC BIKE
ALTI
43