Using Weather Trend Indicator - Suunto ESSENTIAL User Manual

Possible real life situation: Correcting your altitude value
You're hiking and take a break when you see a sign with the
current altitude. You check your Suunto Essential altitude reading
and discover a small difference between the two numbers. You set
the altitude reference value on your Suunto Essential to match that
of the sign.

7.3 Using weather trend indicator

The weather trend indicator is located on the upper side of the
display. It is displayed in the TIME and ALTI & BARO modes,
providing you with quick reference to check upcoming weather
conditions. The weather trend indicator is comprised of two lines
forming an arrow. Each line represents a 3-hour period. The right
line represents the last 3 hours. The left line represents the 3 hours
prior to the last 3 hours. So the line can indicate 9 different patterns
in the barometric trend.
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