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changes of up to 50 feet, and extreme weather
can cause changes of up to 200 feet. Use
the Alt.set feature as often as possible and no
less than once a day to recalibrate altitude and
reset barometric readings to sea-level pressure
adjusted for your altitude.
What is vehicle cabin pressure?
Changes in vehicle cabin pressure, caused
by opening or closing doors or windows or
turning ventilation fans on or off, alters the
barometric pressure. A change of up to ±50
feet in altitude can occur from cabin pressure
changes. To get a more accurate reading, it is
recommended that you close your windows
when traveling at highway speeds and set
your ventilation system to recirculate inside
air instead of bringing in outside air if the fan
is on. Pressing every morning will reset
the altimeter to its original setting.
How can the bearing point feature help me?
Following the position of the sun and spot-
ting familiar landmarks can give you an idea
of what direction you are heading in during
the day. This differs at night or on a foggy day
when the sun and landmarks are obscured.
By setting a bearing point and monitoring
your headings, you can be far more certain of
direction, even on unfamiliar roads.
FREQUENTLY ASKED QUESTIONS
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