Manual Casio 2271 (page 3 of 8) (English)

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2271-3

ALTIMETER

A built-in altimeter uses a pressure sensor to detect the current air pressure,

which is then used to estimate the current altitude. The watch is pre-

programmed with ISA (International Standard Atmosphere) preset values,

which are used to convert air pressure readings to altitude values. If you

preset a reference altitude, the watch will also calculate the current relative

altitude based on your preset value. Altimeter functions also include data

storage memory and an altitude alarm.

Important!

• This watch estimates altitude based on air pressure. This means that

altitude readings for the same location may vary if air pressure changes.

• This watch employs a semiconductor pressure sensor, which is affected by

temperature changes. When taking altitude measurements, be sure to do

so while ensuring that the watch is not exposed to temperature changes.

• Do not rely upon this watch for altitude measurements or perform button

operations while engaging in sports where there are sudden altitude

changes, while sky diving, hang gliding, or paragliding, or while riding a

gyrocopter, glider, or any other aircraft.

• Do not use this watch for measuring altitude in applications that demand

professional or industrial level precision.

How the Altimeter Works

With the Preset Values (No Reference Altitude)

• The watch measures the air pressure at your current location and uses the

built-in ISA values to convert it to the equivalent altitude.

With a Reference Altitude

• After you set the reference altitude, the watch adjusts its air pressure to

altitude conversion calculation accordingly.

• To determine the height of a tall building,

set the reference altitude to 0 on the

ground floor. Note, however, that you may

not be able to get a good reading if the

building is pressurized or air-conditioned.

• When mountain climbing, you can set the

reference value in accordance with a

marker along the way or altitude

information from a map. After you do this,

the altitude readings produced by the

watch will be more accurate than they

would without a reference altitude.

• Note that the following conditions will

prevent you from obtaining accurate readings:

When air pressure changes because of changes in the weather

Extreme temperature changes

When the watch itself is subjected to strong impact

Understanding the Altimeter Screen

Press E to enter the Altimeter Mode.

• Altitude is displayed in units of 5 meters (20 feet).

• The measurement range for altitude is –700 to 10,000 meters (–2,300 to

32,800 feet).

• The measured altitude may be a negative value in cases where there is a

reference altitude value set or because of certain atmospheric conditions.

• The displayed altitude value changes to

xxxx meters (or feet) if a

measured altitude falls outside the measurement range. The altitude value

will be displayed again as soon as the measured altitude is within the

allowable range.

• You can change the unit of measurement for the displayed altitude values

between meters (m) and feet (ft). See “To change the Altitude Units”.

About Altitude Measurements

There are two types of altitude measurements: those for displayed data

(Altimeter Mode measurements) and those for memory data (Memory

measurements).

Altimeter Mode measurement

This type of measurement is performed only when the watch is in the

Altimeter Mode. As soon as you enter the Altimeter Mode, measurements are

taken every five seconds for the first three minutes. After that, measurements

are taken every two minutes.

• The ALTI indicator flashes on the display while a measurement is in progress.

400

Remaining memory

1 second later

Altitude graph (current altitude flashing) (unit: 10m/40 ft.)

Altitude

Timekeeping Mode time

▲

Memory measurements

Memory measurements are taken independently of Altimeter Mode

measurements and stored directly into memory (along with the date and time

of the measurement) for later recall. There are two types of memory

measurements: “Auto measurements” and “Manual measurements”.

Auto measurements

With Auto measurement, the watch continuously performs measurements

whenever the minutes in the Timekeeping Mode reach 00, 15, 30, or 45, until

you switch Auto measurements off. The watch continues to take

measurements regardless of whether or not you change modes, so you can

keep a running log of altitude changes automatically.

Manual measurements

You can use the manual procedure to take a reading anytime you want to

store your current altitude data into memory for later recall. Manual memory

measurements can be performed only while the watch is in the Altimeter

Mode.

Selecting Auto or Manual Measurement

Use the following procedure to switch between Auto or Manual measurement.

Note that you cannot perform this operation while a preset Auto measurement

is already in progress.

To select Auto or Manual measurement

1. In the Altimeter Mode, hold down A until

the display clears. After four or five

seconds, either

OFF or the current

reference altitude value (if set) will start to

flash, which indicates the setting screen.

2. Press D twice to move the flashing to the

memory measurement setting (AUTO or

MANUAL).

• Press D to move the flashing in the sequence shown below.

Reference

Altitude

Alarm

Memory

Measurement

Altitude

Unit

3. While the memory measurement setting is flashing, press B or E to

select AUTO (Auto measurement) or MANUAL (Manual measurement).

4. Press A to exit the setting screen.

• An indicator on the display shows the type of measurement (AUTO or

MANUAL) that you currently have selected.

To use Auto measurement

1. Confirm that the AUTO indicator is shown on the display.

• If it is not, use the procedure under “To select Auto or Manual

measurement” to select Auto measurement.

2. In the Altimeter Mode, hold down E until the watch emits a short beep,

indicating the start of the measurement.

3. To stop measurements at any point in the Altimeter Mode, hold down E

again until the watch emits a short beep.

• The data that is measured when you first start Auto measurement is

also stored into memory.

• The AUTO indicator flashes on the display when you start Auto

measurements. The AUTO indicator continues to flash (indicating that

measurements continue) even if you change modes.

• Auto measurement cuts off automatically whenever there are 49

records stored in memory. The 50th record measurement when you

stop measurement in step 3 above is also stored in memory.

• A final measurement is taken when you turn off Auto measurement,

and that data is also stored into memory. Such data is indicated by

FIN during the recall operation.

To use Manual measurement

1. Confirm that the MANUAL indicator is shown on the display.

• If it is not, use the procedure under “To select Auto or Manual

measurement” to select Manual measurement.

2. In the Altimeter Mode, hold down E until the watch emits a short beep,

indicating that a measurement is taken.

• Repeat step 2 whenever you want to take a reading.

• Button operation becomes impossible during the four or five seconds

that it takes to complete a measurement. Normal operation will return

once the operation is finished.

Setting a Reference Altitude

After you set a reference altitude, the watch adjusts its air-pressure-to-altitude

conversion calculation accordingly. The altitude measurements produced by

this watch are subject to error caused by changes in air pressure. Because of

this, we recommend that you update the reference altitude whenever one is

available during your climb.

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Casio 2271 Manual

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