Subaru 2001 Impreza Owner's Manual page 165

n 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.
Interior equipment
HS6013BB
HS6014BB
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