1999 Subaru Forester Owner's Manual - Page 169

The display indicates atmospheric pressure in the passenger compartment. Range: 21.26 to 30.86 inHg or 720 to 1045 hpa NOTE D The reading may change during air-conditioner operation, door window operation, driving in a tunnel, and so forth. D All barometric readings reported in local weather reports are corrected to a sea-level reading regardless of altitude. The Gauge Pack displays true local air pressure and hence may differ significantly from local weather reports (especially at higher altitudes). The barometer is not adjustable. D Since air pressure changes with altitude, the barometric reading will vary when the vehicle is moving up or down an incline. For accurate barometric trending, the vehicle should be stationary. J Altimeter The altimeter has two modes, Standard elevation mode and Relative elevation mode. HS6013BB 6-16