Operation Guide 2891
❚Application: Obtaining an altitude reading with the watch that is close to
the absolute altitude above sea level
The best way to obtain an altitude reading with the watch (relative altitude) that is close to the absolute altitude above sea level is to set altitude values obtained from markers provided at the seashore or along a mountain path as your reference altitude value. This should be done immediately before using the watch to take altitude readings.
•Note that daily fluctuations in atmospheric pressure affect altitude readings, so you should set the reference altitude just before you are ready to take readings.
Example: To set an indicated altitude of 400 meters above sea level as the reference altitude
1. At Point A in the illustration, set the reference altitude to 400 meters, which is the absolute altitude above sea level indicated on a marker provided along the trail.
2. Take altitude readings from Point A to Point B.
3. If there is another absolute altitude marker at Point B, update the reference altitude.
•Be sure to update the reference altitude at Point B if the value displayed by the watch is different from the
absolute altitude indicated by | Point B | |
the marker along the trail at | ||
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Point B. |
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Point A |
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400 |
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Altitude Reading Precautions
Readings that are close to the absolute altitude above sea level are not possible under the following conditions.
•During volatile weather conditions
•During sudden temperature changes
•When the watch is being subjected to strong impact
❚Altitude Terminology
There are two different methods that can be used to express altitude.
Altitude above Sea Level
This is an absolute measurement of altitude above sea level.
Relative Altitude
This expresses the difference in altitude between two locations (altitude differential).
• Your watch measures relative altitude.
Absolute Altitude and Relative Altitude
Building Height: | Roof is 230 |
130 meters | meters above |
Relative Altitude | sea level. |
(Altitude | Altitude above |
Differential) | Sea Level |
Sea |
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❚Altitude Reading Precautions
•Your watch converts barometric pressure readings into altitude values. Because of this, changes in local barometric pressure can cause different results for altitude readings taken in the same location.
Example: Even if you set zero for the reference altitude at ground level, a difference in atmospheric pressure can produce different altitude readings.
If you set a reference altitude of zero at ground level on December 28 (fair, high barometric pressure of 1,030 hPa), the same location will show an altitude of 335 meters on December 31 (rain, low barometric pressure of 990 hPa).
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| 12/28 and 12/31 displayed altitude | Altitude | |||
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| 12/28 <Mountain Height> 12/31 | above | |||
• Height of a building and |
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mountain from ground | 959hPa | 921hPa |
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500m | 835m |
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level (relative altitude) |
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| 600m | |||
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| 12/28 <Building Height> 12/31 Mountain | ||||
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| 994hPa | 955hPa | Peak |
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| 200m | 535m |
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| 500m | 300m | |||
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Building Height | 12/28 <Ground Level> 12/31 |
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| 200m |
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Sea Level |
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| 1,018hPa | 978hPa |
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Barometric Pressure |
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0m | 335m |
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12/28 | 12/31 |
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| 100m |
1,030hPa | 990hPa |
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| 100 meters above sea level |
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| 0m | ||||
(Seal Level) |
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•Accurate readings are not possible when barometric pressure and temperature are fluctuating widely due to sudden and severe changes in the weather.
Example: When you approach a low pressure area while mountain climbing, the drop in pressure produces altitude readings that are higher than the actual altitude.
•To avoid the effect of sudden temperature changes on readings, wear the watch so it is in direct contact with your wrist while taking readings.
•Remember that the air inside of a commercial aircraft is pressurized. Because of this, the readings produced by this watch will not match the altitude readings announced by the flight crew.
•This watch is designed to take altitude readings at preset intervals. Never try to use it for altitude readings while engaged in the following types of sports, during which altitude can change very rapidly over a short time span.
Example: Skydiving, hang gliding, paragliding, gyrocopter flying, glider flying, etc.
Sensor Error Detection
The watch disables the sensor operation and displays the indicator described below whenever a sensor malfunctions or when faulty contact makes correct readings impossible.
Using the Stopwatch Use the D button to enter the Stopwatch Mode as shown under “Modes and Display Screens”.
The stopwatch measures elapsed time in units of 1/100 second up to 9 hours, 59 minutes, 59.99 seconds (10 hours). When the maximum limit is reached, the elapsed time returns to zero automatically and timing continues from there.
When sensor malfunction occurs
• When a pressure sensor or direction sensor occurs, | Barometric Pressure | Altitude | Direction | |
“ERR” flashes on the display for about two seconds | ||||
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and then readings stop. |
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• When sensor malfunction occurs, take your watch to |
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your nearest CASIO Service Center to have it |
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checked. |
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If “ERR” appears
1. If “ERR” appears while you are taking a pressure, altitude, temperature, or direction reading, try taking the reading again. If “ERR” appears again, it probably means that the sensor is malfunctioning. Take your watch to the nearest CASIO Service Center to have it checked.
•If “ERR” disappears from the display right away, check, it could indicate the following.
2.Regardless of whether the current battery level is Level 2 or higher, the watch may determine that the current power level is not enough to driver the sensor in the Compass, Pressure, or Altitude Mode. If this happens, “ERR” will appear on the display and the sensor will not take the reading.
•This does not indicate malfunction. In this case, normal operation should return after battery power recovers.
❚To use the stopwatch
In the Stopwatch Mode, press the C button to start and stop the stopwatch.
(Split/Reset)
1/100 second
Hour, Minute, 
Second
(Start/Stop)
Current Time
•Pressing the A button while an elapsed time operation is being performed freezes the current time on the display and continues timing of the next split internally. This condition is indicated by the “SP” (split) indicator on the display.
•Changing to another mode while a split time is displayed cancels the split time operation.
•Pressing the A button while timing is stopped resets the stopwatch.
❚To perform elapsed time measurement
Start Stop Reset
Cumulative Time Measurement
Pressing the C button to restart the stopwatch without resetting it to all zeros causes the elapsed time measurement to resume from where it was last stopped.
❚To perform split time measurement
Start | Record Split Release Split | Stop | Reset |
Split Time Screen
❚To time 1st and 2nd place finishers
Start | 1st Finisher | 2nd Finisher Displays time | Reset |
| (Displays time | of 2nd finisher. | 15 |
| of 1st finisher.) |
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