Subaru Impreza 2.2L MT Owner's Manual page 177

Interior equipment
HS6014BB
B Standard elevation mode
The "MODE" switch changes the barometer to the standard elevation
mode of the altimeter.
The altimeter indicates the "sea level" elevation.
Range: –660 to 9200 ft (–200 to 2800 m) at a pitch of 20 ft or 10 m in
metric measurement units.
Adjustment: In order to get a precise elevation, manually correct the
altimeter when the current elevation is known.
"YSET": 20 ft increase or 10 m increase in metric measurement units.
"B": 20 ft decrease or 10 m decrease in metric measurement units.
NOTE
D The indication may change during air-conditioner operation, door
window operation, driving in a tunnel, and so forth.
D Adjustable elevation is 780 ft ( 300 m).
D To cancel the adjustment and return to the default altimeter read-
ing, press the "YSET" and "B" switch together for 1 second or more.
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