Altimeter Functions - Casio QW-1471 Manual

To recall data from memory
While in the Digital Compass Mode, use D
Magnetic north indicator
to scroll through the data in the following
Direction
Date
sequence.
B
A
P
A S
To delete data
BEARING
C D
1. While in the Digital Compass Mode,
E
scroll through the data items and display
the one you want to delete.
Time
2. Hold down A until the displayed value
Memory No.
Direction value
changes to "– – –".
Holding down A causes the message "CLR" to appear on the display,
followed by the value changing to "– – –".
Digital Compass Precautions
This watch features a built-in magnetic bearing sensor that detects
terrestrial magnetism. This means that the northern direction indicated by
this watch is magnetic north, which is somewhat different from true polar
north. The magnetic north pole is located in northern Canada, while the
magnetic south pole is in southern Australia. Note that the difference
between magnetic north and true north as measured with all magnetic
compasses tends to be greater as one gets closer to either of the magnetic
poles. You should also remember that some maps indicate true north
(instead of magnetic north), and so you should make allowances when
using such maps with this watch.
Location
Using the Digital Compass when you are near a
source of strong magnetism can cause large errors in
readings. Because of this, you should avoid using the
Digital Compass while in the vicinity of the following
types of objects: permanent magnets (magnetic
necklaces, etc.), concentrations of metal (metal doors,
lockers, etc.), high tension wires, aerial wires, household appliances (TVs,
personal computers, washing machines, freezers, etc.)
Accurate direction measurements are impossible while in a train, boat, air
plane, etc.
Accurate measurements are also impossible indoors, especially inside
ferroconcrete structures. This is because the metal framework of such
structures picks up magnetism from appliances, etc.
Storage
The precision of the compass may deteriorate if the watch becomes
magnetized. Because of this, you should be sure to store the watch away
from magnets or any other sources of strong magnetism, including:
permanent magnets (magnetic necklaces, etc.) and household
appliances (TVs, personal computers, washing machines, freezers, etc.)
Whenever you suspect that the watch may have become magnetized,
perform one of the calibration procedures under "Calibrating the Digital
Compass".
Calibrating the Digital Compass
Whenever you suspect that the readings produced by the Digital Compass
are wrong, you should calibrate it. You can use either one of two calibration
procedures: bidirectional calibration or northerly calibration.
You should use bidirectional calibration when you want to calibrate the Digital
Compass to operate within an area exposed to magnetic force. This type of
calibration should be used if the watch become magnetized for any reason.
With northerly calibration, you "teach" the watch which way is north (which
you have to determine with another compass or some other means). You
could use this calibration procedure, for example, to set the watch to
indicate true north instead of magnetic north.
Important!
If you want to perform both bidirectional and northerly calibration, be sure
to perform bidirectional calibration first, and then perform northerly
calibration. This is necessary because bidirectional calibration cancels
any previously set northerly calibration setting.
If you do not perform any button operation for two or three minutes while
either calibration procedure is in progress (while the magnetic north
indicator is flashing at the 12 or 6 o'clock position), the watch
automatically returns to the Digital Compass Mode.
The more correctly you perform bidirectional calibration, the better the
accuracy of your Digital Compass readouts. You should perform
bidirectional calibration whenever you change environments where you
use the Digital Compass, and whenever you feel that the Digital Compass
is producing incorrect readings.
Normal
Memory 1 Memory 2
Display
Memory 5
Memory 4 Memory 3
To perform bidirectional calibration
B
A
A S
BEARING
D
C
E
3. Rotate the watch 180 degrees.
4. Press B again to calibrate the second direction.
When the calibration procedure is complete, the message "OK" appears
in the upper display. After a short while, the watch automatically returns
to the Digital Compass Mode.
Precautions about bidirectional calibration
You can use any two opposing directions for bidirectional calibration. You
must, however, make sure that they are 180 degrees opposite each
other. Remember that if you perform the procedure incorrectly, you will
get wrong readings from the Digital Compass.
Do not move the watch during the one or two seconds (from the point you
press B up to the point that "OK" appears in the upper display) that the
calibration of each direction is in progress. If you do, the message "ERR"
appears in the upper display. When this happens, restart the bidirectional
calibration procedure from the beginning.
The appearance of "ERR" during bidirectional calibration can also be
caused by local interference. If you suspect that this is the case, move to
another location and try the procedure again.
You should perform bidirectional calibration in an environment that is the
same as that where you plan to be using the Digital Compass. If you plan
to use it in an open field, for example, calibrate in an open field.
To perform northerly calibration
A B
A S
BEARING
C D
E
When the calibration procedure is complete, the message "OK" appears
in the upper display. After a short while, the watch automatically returns
to the Digital Compass Mode.

ALTIMETER FUNCTIONS

A built-in altimeter uses a pressure sensor to detect the current air
pressure which is then used to estimate the current altitude in accordance
with ISA (International Standard Atmosphere) values for altitude and air
pressure. 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.
Sudden changes in the weather make it impossible to produce accurate
altitude readings.
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 use this watch while participating in sports where there are
sudden altitude changes. Also, do not use this watch for applications that
demand professional or industrial level precision. This watch should not
be used while engaging in the following activities: sky diving, hang
gliding, paragliding, gyrocopter riding, glider riding, etc.
— 5 —
1. While in the Digital Compass Mode
(Normal Display), hold down A until the
upper display changes to show "–1–".
At this time, the magnetic north indicator
flashes at the 12 o'clock position to
indicate that the watch is ready to
calibrate the first direction.
2. Place the watch on a level surface, and
press B to calibrate the first direction.
When the calibration procedure is complete,
the message "OK" appears in the upper
display. This soon changes to "–2–" and the
magnetic north indicator flashes at the 6
o'clock position to indicate that the watch is
ready for the second direction.
1. While in the Digital Compass Mode
(Normal Display), hold down A until the
upper display changes to show "–1–".
2. Press C to start the northerly calibration
procedure.
At this time, the indicator "N" appears in
the upper display.
3. Place the watch on a level surface, and
position it so that its 12 o'clock position
points north (as measured with another
compass).
4. Press B to start the calibration
operation.