Taking Altitude Readings - Casio 5242 Operation Manual

Using the Compass While Mountain Climbing or Hiking
Having an idea of your current location and your destination is essential when mountain climbing or hiking.
To do this, you need to "set the map", which means to align the map so the directions indicated on it are
aligned with the actual directions of your location. Basically what you are doing is aligning north on the
map with north as indicated by the watch.
To set a map
1. Make sure the watch is in the Timekeeping Mode.
North indicated North indicated
• For information about changing modes, see "Selecting a Mode"
on the map on the map
(page E-24).
2. While keeping the watch horizontal, press C.
The v v Mode Hand will move to COMP and a direction reading
•
operation will start.
After about three seconds, the c c Second Hand will points to
•
magnetic north.
To update a reading, press C again.
•
N N
3. Keeping the watch still, rotate the map so its north indication is pointing
in the same direction as the c c Second Hand of the watch.
4. While comparing the contours on the map with what you can see
around you, determine your current location and destination on the
map.
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• Note that map reading skills and experience are required to
N N
determine your current location and destination on a map.
North indicated by North indicated by
c Second Hand c Second Hand
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Taking Altitude Readings

The Altimeter Mode uses a pressure sensor to take altitude readings by measuring changes in air
pressure. The result of an altitude reading is indicated by the hands of the watch.
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values (initial default method) or using a
reference altitude specifi ed by you.
When you measure altitude based on preset values
Data produced by the watch's barometric pressure sensor is converted to approximate altitude based on
ISA (International Standard Atmosphere) conversion values stored in watch memory.
When you measure altitude using a reference altitude specifi ed by you
After you specify a reference altitude, the watch uses that value to convert
barometric pressure readings to altitude (page E-46).
• When mountain climbing, you can specify a reference altitude value in
accordance with a marker along the way or altitude information from a
map. After that, the altitude readings produced by the watch will be more
accurate than they would without a reference altitude value.
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To take an altitude reading
1. Make sure the watch is in the Timekeeping Mode.
• For information about changing modes, see "Selecting a Mode"
(page E-24).
2. Press A.
The v v Mode Hand will move to ALTIMETER m (meters) or ft
•
(feet). This indicates the currently selected altitude unit setting.
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For information about how to change the setting, see "To specify
altitude, barometric pressure, and temperature units" (page E-62).
The c c Second Hand will move to 0 indicating that altitude
•
reading operation has started. The v v Mode Hand will point
to ALTIMETER [–] in the case of a negative reading, or to
ALTIMETER 1 (x 10000) for 10,000 feet, 2 (x 10000) for 20,000 feet,
or 3 (x 10000) for 30,000 feet to indicate the altitude reading.
The c c Second Hand will indicate the 10s digit value, the x x Minute
•
Hand the 100s digit value, and the z z Hour Hand the 1000s digit
value of the reading within 10 seconds.
3. Press B to return to the Timekeeping Mode.
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Calibrating the Altitude Sensor Reading
Altitude readings can be affected by changes in atmospheric pressure and temperature changes, and by
changes in temperature at different altitudes. When on a mountain, it is a good idea to calibrate the
altitude sensor reading with altitude values provided by signposts or from other sources.
To calibrate the altitude sensor reading
1. In the Altimeter Mode, loosen the crown and then pull it out.
• If the watch is currently performing an altitude reading operation,
the hands will move to indicate your current altitude.
• If the hands do not indicate an altitude, pulling out the crown will
take an altitude reading. The hands will indicate the result after
about 10 seconds.
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2. Rotate the crown to adjust the indicated altitude reading to the desired
reference altitude value.
The c c Second Hand moves in 10-meter (40-foot) increments.
•
• After you set an altitude reference value, you can clear it any time
by performing step 1 of this procedure and then pressing A and
C at the same time. This will cause the hands to move to the result
Example: 990 meters Example: 990 meters of the last altitude reading the watch performed.
• You can toggle the altitude unit between meters (m) and feet (ft) at
this time by holding down C for two seconds.
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Operation Guide 5242
B B
A A
400 400
Compass Precautions
Magnetic North and True North
True north True north
There are actually two types of north: magnetic north and true north.
Magnetic north is the direction indicated by a compass, while true north is
the direction towards the North Pole. Magnetic north and true north are
not the same.
Location
Taking a direction reading when you are near a source of strong
magnetism can cause large errors in readings. Because of this, you
should avoid taking direction readings while in the vicinity of the following
types of objects: permanent magnets (magnetic accessories, etc.), large
concentrations of metal (metal doors, lockers, etc.), high-tensile wire,
overhead wires, household appliances, offi ce equipment, mobile phones.
• Accurate direction readings are impossible while in a train, boat, air
plane, etc.
• Accurate readings are also impossible indoors, especially inside
ferroconcrete structures. This is because the metal framework of such
Magnetic north Magnetic north
structures picks up magnetism from appliances, etc.
Storage
The precision of the bearing sensor may deteriorate if the watch becomes magnetized. Because of this,
you should store the watch away from magnets or any other sources of strong magnetism, including:
permanent magnets (magnetic accessories, etc.), household appliances, offi ce equipment, mobile
phones.
• Whenever you suspect that the watch may have become magnetized, perform the procedure under "To
perform bidirectional calibration" (page E-37).
Hand Indicators
z z Hour Hand: Indicates the 1000s digit value.
x x Minute Hand: Indicates the 100s digit value.
c c Second Hand: Indicates the 10s digit value.
v v Mode Hand: Indicates the altitude unit as meters (ALTIMETER m) or feet (ALTIMETER ft). The hand
will point to ALTIMETER [–] in the case of a negative reading, or to ALTIMETER 1
(x 10000) for 10,000 feet, 2 (x 10000) for 20,000 feet, or 3 (x 10000) for 30,000 feet to
indicate the altitude reading.
For example, when the altitude is 10,000 meters, the v v Mode Hand will point to ALTIMETER m
•
(meters). The z z Hour Hand points to 10. The x x Minute Hand and c c Second Hand points to 0.
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Example: 2,780 meters Example: 10,000 meters
Note
• The unit for altitude readings by this watch is 10 meters (40 feet).
• The measurement range for altitude readings by this watch are –700 to 10,000 meters (–2,280 to
32,800 feet). The display range is –3,000 to 10,000 meters (–9,840 to 32,800 feet).
• Normally, altitude readings are in relation to an initial default reference value. You can also specify a
different reference altitude value if you want. See "Calibrating the Altitude Sensor Reading" (page
E-46).
• You can specify either meters (m) or feet (ft) for displayed altitude values. See "To specify altitude,
barometric pressure, and temperature units" (page E-62).
• Whenever an altitude reading is outside the allowable measurement range, the hands of the watches
will move to the positions below.
z z Hour Hand, x x Minute Hand, c c Second Hand: 11 o'clock
v v Mode Hand: ALTIMETER m (meters) or ALTIMETER ft (feet)
3. After the setting is the way you want, push the crown back in and then
lock it.
• For information about the altitude reference value range, see the
altitude display range on page E-45.
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Example: 1,000 meters Example: 1,000 meters
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Example: 23,840 feet
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