Suunto X9i Guide De L'utilisateur page 23

Setting the reference altitude
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NOTE: When the GPS is on, find the altitude reference from the position display in
the Function menu.
NOTE: When the GPS is on, find the sea level reference from Alti/Baro mode by
choosing Baro use.
Setting the altitude/barometric alarms
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NOTE: The baro alarm functions if the barometric pressure changes 4 hPa/0.118
inHg.
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