Operation Guide 3173 3246
Using the Altitude Differential Value While Mountain Climbing or Hiking
After you specify the altitude differential start point while mountain climbing or hiking, you easily can measure the change in the altitude between that point and other points along the way.
To use the altitude differential value• Entering the Altimeter Mode starts a new altitude auto measurement session, but it does not reset the |
current ASC |
This means that the starting ASC and DSC values for a new Altimeter Mode auto measurement session |
are the values that currently are in memory. Each time you complete an Altimeter Mode auto |
measurement session by returning to the Timekeeping Mode, the vertical ascent value of the current |
Destination altitude
Current location
Altitude differential
1.In the Altimeter Mode, check to make sure that an altitude reading is on the display.
•If an altitude reading is not displayed, press A to take one. See “To take an altimeter reading” for details.
2.Use the contour lines on your map to determine the difference in altitude between your current location and your destination.
3.In the Altimeter Mode, press E to specify your current location as the altitude differential start point.
•The watch will take an altitude reading and register the result as the altitude differential value start point. The altitude differential value will be reset to zero at this time.
4.While comparing the altitude difference you determined on the map and the watch’s altitude differential value, advance towards your destination.
•If the map shows that the difference in altitude between your location and your destination is +80 meters for example, you know you will be nearing your destination when the displayed altitude differential value shows +80 meters.
session (920 meters in the above example) is added to the session’s starting ASC value. Also, the |
vertical descent value of the current auto measurement session |
added to the session’s starting DSC value. |
• Note that any change in elevation when ascending that is less than 15 meters (49 feet) is not added to |
the vertical ascent value for the current Altimeter Mode auto measurement session. Also, any change in |
elevation when descending that is less than |
value for the current Altimeter Mode auto measurement session. |
Note
•The maximum altitude, minimum altitude, vertical ascent, and vertical descent values are retained in memory when you exit the Altimeter Mode. To clear values, perform the procedure under “To clear the contents of a specific memory area”.
Using Auto Save ValuesThe watch maintains two independent sets of auto save values as shown below.
| Set 1 | Set 2 |
Maximum Altitude | Maximum Altitude |
Minimum Altitude | Minimum Altitude |
Vertical Ascent | Vertical Ascent |
Vertical Descent | Vertical Descent |
Altitude
Specifying a Reference Altitude Value
The altitude readings 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 value whenever one is available during your climb. After you specify a reference altitude value, the watch adjusts its
The values in Set 1 and Set 2 can be cleared independently of each other. This means you can use them to keep track of daily and cumulative data as described in the example below.
Example: Keeping track of data on a
Clear both Set 1 and Set 2, and start your Day 1 climb.
At the end of the day, both sets of auto save values contain the same data
Day 2
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1.In the Altimeter Mode, hold down E until the current reference altitude value starts to flash. This is the setting screen.
•Before the reference altitude value starts to flash, the message SET Hold will appear on the display. Keep E depressed until SET Hold disappears.
2.Press A (+) or C
•Specify a reference altitude value based on accurate altitude information about your current location from a map, etc.
•You can set the reference altitude value within the range of
•Pressing A and C at the same time returns to OFF (no reference altitude value), so the watch performs air pressure to altitude conversions based on preset data only.
Clear only Set 1, and start your Day 2 climb. At the end of the day, the values in Set 1
Day 3
Clear only Set 1, and start your Day 3 climb. At the end of the day, the values in Set 1 will show the results of Day 3 only. In Set 2,
•For details about clearing altitude data, see “To clear the contents of a specific memory area”.
How does the altimeter work?
3. Press E to exit the setting screen.
Types of Altitude Data
The watch can maintain two types of altitude data in its memory: manual measurement records, and auto save values (minimum, maximum, vertical ascent, vertical descent).
•Use the Data Recall Mode to view data stored in memory. See “Viewing Altitude Records” for details.
Manual Measurement Records
Any time you perform the procedure below in the Altimeter Mode, the watch will create and store a record with the currently displayed altitude reading, along with the date and time the reading was taken. There is enough memory to store up to 25 manual measurement records, which are numbered from REC01 through REC25.
To save a manual measurement1. In the Altimeter Mode, check to make sure that an altitude reading is on the display.
• If an altitude reading is not displayed, press A to take one. See “To take an altimeter reading” for details.
2. Hold down A until REC Hold appears on the display and then disappears. Release A after Hold disappears.
• This will save the currently displayed altitude reading in a manual measurement record, along with the measurement time and date.
•The watch will return to the Altimeter Mode screen automatically after the save operation is complete.
•There is enough memory to store up to 25 manual measurement records. If there are already 25 manual measurement records in memory, the above operation will cause the oldest record to be deleted automatically to make room for the new one.
Auto Save Values
Two sets of auto save values (Set 1 and Set 2) are maintained in watch memory.
Set 1 | Set 2 |
Maximum Altitude | Maximum Altitude |
Minimum Altitude | Minimum Altitude |
Vertical Ascent | Vertical Ascent |
Vertical Descent | Vertical Descent |
•These values are checked and updated automatically by the watch as altitude auto measurements are taken.
How Maximum and Minimum Values Are UpdatedWhile the watch is in the Altimeter Mode, altitude readings are taken automatically at the interval specified by the altitude auto measurement method. With each reading, the watch compares the current reading against the MAX
620 m
Session end point
Session start point
320 m
120 m
20 m
0 m
The total Vertical Ascent and Vertical Descent values produced by an Altimeter Mode measurement session during the example climb illustrated above are calculated as follows.
Vertical Ascent: q (300 m) + e (620 m) = 920 m
Vertical Descent: w (320 m) + r (500 m) = 820 m
Generally, air pressure and temperature decrease as altitude increases. This watch bases its altitude measurements on International Standard Atmosphere (ISA) values stipulated by the International Civil Aviation Organization (ICAO). These values define relationships between altitude, air pressure, and temperature.
| Altitude |
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| Temperature | ||||||||||
4000 m |
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| 616 hPa |
| About 8 hPa per 100 m |
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3500 m |
| 701 hPa |
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3000 m |
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| About 9 hPa per 100 m |
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| About 6.5°C | |||||
2500 m |
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795 hPa |
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| 2°C | per 1000 m | ||||||||
2000 m |
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| About 10 hPa per 100 m |
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1500 m | 899 hPa |
| About 11 hPa per 100 m |
| 8.5°C |
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1000 m |
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500 m | 1013 hPa |
| About 12 hPa per 100 m |
| 15°C |
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0 m |
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14000 ft. | 19.03 inHg |
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| 16.2°F |
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12000 ft. |
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| About 0.15 inHg per 200 ft. |
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10000 ft. | 22.23 inHg |
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| 30.5°F |
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8000 ft. |
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| About 0.17 inHg per 200 ft. |
| About 3.6°F | ||||||||
6000 ft. | 25.84 inHg |
| About 0.192 inHg per 200 ft. | 44.7°F | per 1000 ft. | |||||||||
4000 ft. |
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2000 ft. | 29.92 inHg |
| About 0.21 inHg per 200 ft. | 59.0°F |
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0 ft. |
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Source: International Civil Aviation Organization
•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
There are two standard methods of expressing altitude: Absolute altitude and relative altitude. Absolute altitude expresses an absolute height above sea level. Relative altitude expresses the difference between the height of two different places.
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| Height of building 130 m |
| Rooftop at an altitude of | |||||||||
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| (relative altitude) |
| 230 m above sea level | |||||||||
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| (absolute altitude) | |||||
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| Sea Level | |||
Altimeter Precautions
•This watch estimates altitude based on air pressure. This means that altitude readings for the same location may vary if air pressure changes.
•The semiconductor pressure sensor used by the watch for altitude measurements is also affected by temperature. When taking altitude measurements, do not subject the watch to temperature changes.
•Do not rely upon this watch for altitude measurements or perform button operations while sky diving, hang gliding, or paragliding, while riding a gyrocopter, glider, or any other aircraft, or while engaging in any other activity where there is the chance of sudden altitude changes.
•Do not use this watch for measuring altitude in applications that demand professional or industrial level precision.
•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 or indicated the flight crew.
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