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always occurs ahead of a change in weather conditions. A pressure
change during an interval of about two to three hours is the best indi-
cator for a weather forecast.
Interpreting Weather Information
The iFINDER Expedition's Weather Prediction utility is found in two
data boxes on the Digital Data page. (This page is available only in Ad-
vanced Mode.) The Pressure History box at the top has a bar chart.
Each bar represents a past hourly pressure reading (up to 23 hours
old), plus the current reading. The Weather Symbol box at lower left
reflects the current trend shown in the Pressure History bar chart.
Digital Data page with barometric Pressure History box at the top and
Weather Symbol box at lower left.
When the iFINDER is first turned on and determines its position and
the local time, it takes a barometric pressure reading. As long as the
unit is on or in Sleep Mode, it records a pressure reading every hour.
Each reading is shown as a vertical bar in the Pressure History box. The
bar at far right is always the current pressure. The oldest reading is at the
left side of the chart. You can press the ← and → keys to scroll through
these readings. You can also use ↑ to switch to altitude values or the GPS
Position display or ↓ to return to atmospheric pressure values.
Weather Symbol box
shows icon indicat-
ing current weather
trend.
Pressure History
box shows hourly
barometer readings.