Operation Guide 3147
How the Altimeter Measures Altitude
The altimeter can measure altitude based on its own preset values, or a reference altitude specified by you.
When you measure altitude based on preset values
•Nothing is displayed for the altitude change indicator when the current altitude reading is outside the watch’s altitude measurement range
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 specified by you
After you specify a reference altitude, the watch will use that value to convert the current barometric pressure reading to altitude.
•When mountain climbing, you can specify a
reference value in accordance with a marker | B |
along the way or altitude information from a |
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map. After that, altitude readings produced | A |
by the watch will be more accurate than they | 400 |
would without a reference altitude. |
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Displaying Your Current Altitude
Altitude change indicator
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More than +20m
+15m
+10m
+5m
±0m
Less than
You can use the procedure described in this section to display your current altitude. If you leave the watch in the Altimeter Mode, it will update the displayed altitude value regularly, and indicate
To specify the altitude reading interval
a window in the upper left of the display.
You can select either of the following two altitude measurement intervals. 0'05": Readings at
2'00": Readings at
•For information about configuring settings for the altitude reading interval and duration, see “To specify the altitude reading interval”.
Important!
•The procedure below simply displays a value indicating your current altitude, without recording it in watch memory. For information about recording altitude readings in watch memory, see “Saving Altitude Readings in Memory”.
To view your current altitude
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Altitude measurement interval
1. | In the Altimeter Mode, hold down A for about |
| two seconds until either OFF or the current |
| reference altitude value starts to flash. This is |
| the setting screen. |
2. | Press D to display the current altitude |
| reading interval setting. |
| • This will cause either 0'05" or 2'00" to flash |
| on the display. |
3. | Press E to toggle the setting between 0'05" |
| and 2'00". |
| • 0'05": Readings at |
| one hour |
| • 2'00": Readings at |
| the first three minutes followed by |
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Altitude change since Altimeter Mode stopwatch measurement started
Altitude graph
Current altitude
Altimeter Mode stopwatch elapsed time
Notes
1.In the Timekeeping Mode, use the Cbutton to enter the Altimeter Mode.
•The watch will start altitude measurement and display the result.
•It can take up to four or five seconds for the first altitude reading to appear.
2.If you leave the watch in the Altimeter Mode, the current altitude value and the altitude change value will be updated according to the altitude reading interval.
•If you want to restart the operation at any point, press C.
3.To stop taking altitude readings, press D to exit the Altimeter Mode.
4. Press A to exit the setting screen. |
Saving Altitude Readings in Memory
The following describes the different types of records the watch creates for altitude readings.
•You can take manual altitude readings, which are stored in memory along with the date (year, month, day) of the reading. There is enough memory to hold up to 20 altitude records (readings).
•The Altimeter Mode has a stopwatch (which is independent of the watch’s Stopwatch Mode) that you can use to time your climbs. While the Altimeter Mode stopwatch is running, the watch takes altitude readings automatically (without storing them in memory). Each time you reset the Altimeter Mode stopwatch to all zeros, the highest altitude, lowest altitude, cumulative ascent, and cumulative descent achieved during the last Altimeter Mode stopwatch session are stored in a “current stopwatch session record”.
•A separate “historical record” keeps track of the highest altitude, lowest altitude, cumulative ascent, and cumulative descend of all past Altimeter Mode stopwatch sessions.
•Normally, displayed altitude values are based on the watch’s preset conversion values. You also can specify a reference altitude, if you want. See “Specifying a Reference Altitude”.
•Altitude is displayed in units of 5 meters (20 feet).
•The measurement range for altitude is
•An altitude reading may be displayed be a negative value in cases where there is a reference altitude value specified or because of certain atmospheric conditions.
•The displayed altitude value changes to xxxx meters (or feet) if an altitude reading falls outside the measurement range. The altitude value will be displayed again as soon as the altitude reading is within the allowable range.
•You can select either meters (m) or feet (ft) as the measurement unit for displayed altitude value.
•During altitude measurements, the watch may not be able to update its timekeeping display contents normally. Correct timekeeping is maintained internally, however.
Altitude graph |
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•In the Altimeter Mode, press the Abutton to toggle between the altitude graph and the altitude change indicator. The altitude change indicator shows the relative change between the latest altitude reading and the one before it.
To take a manual altitude reading
1.Press C to enter the Altimeter Mode.
2.Hold down Cfor about one second until REC flashes on the display.
•At this time the watch will beep and the current altitude reading will be saved along with the current date (year, month, day) and time.
3.REC will stop flashing and the watch will return to the Altimeter Mode automatically after data save is complete.
•Memory can hold up to 20 altitude records. Storing a new reading while there already are 20 in memory will delete the oldest record to make room for the new reading.
To take altitude readings using the Altimeter Mode stopwatch
1.In the Timekeeping Mode, use the Cbutton to enter the Altimeter Mode.
•The watch will start altitude measurement automatically. Note that readings are not saved as altitude records.
2.Press the Ebutton to start and stop the Altimeter Mode stopwatch.
•While an Altimeter Mode stopwatch operation is in progress, the display shows the elapsed time, current altitude, and the change in altitude since the start of the stopwatch operation.
3.After you are finished using the Altimeter Mode stopwatch, press the B
button to reset it to all zeros.
•While an Altimeter Mode stopwatch operation is in progress, you can toggle between the altitude graph and the altitude change indicator by pressing the A button. The altitude change indicator graphically shows how the current altitude reading differs from the previous reading. The type of indicator that appears depends on the relative size of the altitude change.
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