Casio 2891 Operation Manual page 14

Viewing Altitude Memory Records
You can use the Recall Mode to view the records that are stored in memory in the Altitude Mode.
• In the Timekeeping Mode, press the D button once to enter to the Recall Mode.
❚ To view altitude memory records
In the Recall Mode, use the C (forward) and A (back) buttons to scroll through records in altitude memory.
• Holding down either button scrolls at high speed.
Newest Data
Altitude
1-second
interval
Month/Day
Time
Relative Altitude Total Descent
Setting a Reference Altitude
Use the following procedure to set a reference altitude in accordance with a reading produced by another device or an altitude value
obtained from a marker or other source.
Altitudes displayed by your watch can be affected by changes in atmospheric pressure and temperature, and by changes in
temperature at different altitudes. Because of this, it is always a good idea to use the procedure below to update the reference
altitude value in accordance with altitude values indicated on markers along your route.
1. Reference Altitude
In the Altitude Mode, hold
down the E E E E E button for
about two seconds until
"SET" appears at the top
of the display.
• After about four or five
seconds, the altitude value
will appear at the bottom of
the display.
(2 seconds)
2.
Use the C C (+) and A C C C A A A (–) A
buttons to adjust the
reference altitude value.
• Each press of the C button
or A button changes the
displayed value by 5 meters.
Operation Guide 2891
High Altitude
Total Ascent Low Altitude
• Holding down either button scrolls the setting at high speed.
• Pressing the C and A buttons at the same time returns to
the factory default setting, which is indicated by "OFF" for the
reference altitude.
• The reference altitude can be set in a range of –10,000
meters to 10,000 meters.
3.
After the setting is the way
E E
you want, press the E E E
button to return to the
Altitude Mode screen.
• The watch automatically exits the reference altitude setting screen
if you do not perform any operation for about two or three
minutes.
Cumulative Data
In the Recall Mode, each press of the B button toggles the display
between the altitude record screen and the cumulative data screen.
Altitude Record Screen Cumulative Data Screen
When the cumulative data screen is displayed, use the C (forward)
and A (back) buttons to scroll through the cumulative data.
• High altitude and low altitude are not cumulative values.
High Altitude Low Altitude
Total Ascent Total Descent
If temperature reading accuracy is
a priority...
If temperature accuracy is a priority, remove the watch from
your wrist so it is not affected by your body temperature.
• Note, however, that removing the watch from your wrist will make
altitude readings more prone to being affected by changes in air
temperature. Because of this, the chance of altitude measurement
error increases slightly when the watch is removed from the wrist.
• After removing the watch from your wrist, it takes about 20 to 30
minutes before the temperature of the watch becomes the same
as the air temperature.
❚ When you want to measure with either
one a priority
If accurate
If accurate altitude
temperature
readings are a
readings are a
priority, try to keep
priority, keep the
the temperature of
watch from being
the watch as stable
affected by your
as possible.
body temperature.
Example: Keep the
Example: Keep the
watch on
watch
your
inside your
wrist, etc.
bag,
where it is
not
exposed to
direct
sunlight.
Clearing Cumulative Data Memory
Use the procedure below to clear the contents of cumulative data
memory.
• Clearing cumulative data memory deletes high altitude, low
altitude, total ascent, and total descent data.
1.
In the Recall Mode, press
B B
the B B B button to switch to
the cumulative data
screen, and then hold
down the E E E E button. E
2.
After "CLR" appears on
the display, keep the E E E E E
button depressed for two
more seconds until the
watch beeps, indicating
that cumulative data has
been cleared.
Altitude Primer
❚ Relationship between Altitude,
Barometric Pressure, and Temperature
Generally, both barometric pressure and temperature are lower,
the greater the altitude from sea level. This means you can
determine your altitude if you know the current air temperature.
Your watch uses International Standard Atmosphere (ISA) data on
the relationship between altitude and barometric pressure that is
defined by the International Civil Aviation Organization (ICAO) to
estimate your current altitude and displays a relative altitude
value.
Altitude
Pressure
Temperature
8hPa per
4,000m 616hPa –11 o C
100 meters*
3,500m
9hPa per
o
3,000m 701hPa –4.5 C
100 meters*
6.5 o C per
1,000
2,500m
meters*
10hPa per
o
2,000m 795hPa 2 C
100 meters*
1,500m
11hPa per
1,000m 899hPa 8.5 o C
100 meters*
500m
12hPa per
o
1,013hPa 15 C
100 meters*
0m
(International Standard Atmosphere data)
* Approximate
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