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Speed, Average Speed and Max Speed
Speed, Average Speed and Max Speed use changes in GPS Position to
track ground speed.
Trip Time and Trip Distance
Trip Time monitors the amount of time spent on the road and Trip Dis-
tance measures the distance traveled on your trip. Remember, these
values are only recorded while you are moving faster than the speed
threshold.
Weather Prediction (barometer)
People active in the outdoors should always be weather-aware.
Weather affects the movement and behavior of game and fish. It makes
our outdoor adventures pleasant or miserable. It can even injure or kill
us if we are unprepared.
No weather forecast is perfect, but public and private weather report-
ing services have reduced the guesswork when preparing for outdoor
activities. There are times, however, when conventional weather re-
ports are unavailable or not completely accurate for the current condi-
tions at your specific location. This is especially true in remote areas,
far from news or government weather broadcasts.
When you can not get a professional forecast, you need to watch the sky
and interpret the signs based on your woodsman or mariner skills. The
recording barometer in your GPS unit can sharpen your weather skills
by tracking changes in barometric pressure at your location. It will tell
you if local atmospheric pressure is steady, rising or falling — and how
fast. Knowing this pressure history — and how to interpret it — will
make you a better forecaster. Here is how it works:
A barometer measures air pressure in the atmosphere. Most U.S.
weather reports list barometric pressure in inches, which is based on
the height of a column of mercury in a commercial barometer. Chang-
ing air pressure changes the height of the mercury.
Your ExpeditionC has a digital barometer that records air pressure in
millibars. Bar is the metric pressure equivalent of pounds per square
inch, and a millibar is 1/1000 of one bar. For example, a barometric
reading of 29.82 inches is equal to 1,009.1 mb. The unit of measure is
not particularly important here…the critical factor is determining the
trend, whether the air pressure is steady, rising or falling over time.
A larger number means higher pressure. A lower number means lower
pressure. When barometric pressure is higher than average, good
weather is expected. Low pressure indicates clouds and precipitation.
The relative change in pressure over time is an indication of a future
change in weather. This is feasible because a change in air pressure