Casio 2891 Viewing Altitude Memory Records, Cumulative Data, Setting a Reference Altitude, If temperature reading accuracy is, a priority, Altitude Primer

Operation Guide 2891

Viewing Altitude Memory Records	Cumulative Data
You can use the Recall Mode to view the records that are stored in memory in the Altitude Mode.	In the Recall Mode, each press of the B button toggles the display
• In the Timekeeping Mode, press the D button once to enter to the Recall Mode.	between the altitude record screen and the cumulative data screen.

❚ To view altitude memory records	Altitude Record Screen	Cumulative Data Screen
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.

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 the B button to switch to the cumulative data screen, and then hold

Newest Data High Altitude

Altitude

	1-second
	interval
Time	Month/Day

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

down the Ebutton.

2. After “CLR” appears on the display, keep the E button depressed for two more seconds until the watch beeps, indicating that cumulative data has been cleared.

Relative Altitude Total Descent Total Ascent Low Altitude

Total Ascent 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.

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

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.

1. In the Altitude Mode, hold down the E button for about two seconds until “SET” appears at the top of the display.

Reference Altitude

• Holding down either button scrolls the setting at high speed.

• Pressing the Cand 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.

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

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
4,000m	616hPa 8hPa per	–11oC

•After about four or five seconds, the altitude value will appear at the bottom of the display.

(2 seconds)

3. After the setting is the way

you want, press the E button to return to the Altitude Mode screen.

If accurate altitude readings are a priority, try to keep the temperature of the watch as stable as possible. Example: Keep the

If accurate temperature readings are a priority, keep the

watch from being

affected by your body temperature. Example: Keep the

			100 meters*
	3,500m
			9hPa per
3,000m		701hPa	100 meters* –4.5oC
			6.5oC per
	2,500m		1,000
			meters*

2. Use the C(+) and A(–) buttons to adjust the reference altitude value.

•Each press of the Cbutton or Abutton changes the displayed value by 5 meters.

（－）

（＋）

•The watch automatically exits the reference altitude setting screen if you do not perform any operation for about two or three minutes.

watch on your wrist, etc.

watch inside your bag, where it is not exposed to direct sunlight.

2,000m		795hPa	10hPa per	2oC
			100 meters*
	1,500m		11hPa per
1,000m		899hPa		8.5oC
			100 meters*
	500m
		1,013hPa	12hPa per	15oC
	0m		100 meters*
	* Approximate	(International Standard Atmosphere data)

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