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Operation Guide 3148
3
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Altitude graph Altitude change indicator
A
A
• In the Altimeter Mode, press the A button 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.
• Nothing is displayed for the altitude change indicator when the current
altitude reading is outside the watch’s altitude measurement range (–700 to
10,000 meters/–2300 to 32,800 feet).
More than +20m
+15m
+10m
+5m
±0m
–5m
–10m
–15m
Less than –20m
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Altitude change
indicator
To specify the altitude reading 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 A to toggle the setting between 0'05"
and 2'00".
• 0'05":Readings at five-second intervals for
one hour
• 2'00":Readings at five-second intervals for
the first three minutes followed by
two-minute intervals for 10 hours
4. Press A to exit the setting screen.
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Altitude measurement
interval
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.
To take a manual altitude reading
1. Press C to enter the Altimeter Mode.
2. Hold down C for 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 C button to enter the Altimeter Mode.
• The watch will start altitude measurement automatically. Note that
readings are not saved as altitude records.
2. Press the E button to start 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, 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.
Current Stopwatch Session Record
The current stopwatch session record contains the data described below. The
contents of this record are retained until you start a new Altimeter Mode
stopwatch measurement session.
• The maximum total ascent and total descent value is 99,995 meters
(or 99,980 feet). Each value reverts to zero after the maximum is reached.
How current Altimeter Mode stopwatch session record data is updated
Note
• When you press E to start a new Altimeter Mode stopwatch session, the
watch will clear data that is already stored in the current stopwatch session
record.
Data
High Altitude
(MAX)
Low Altitude
(MIN)
Total Ascent
(ASC)
Total Descent
(
DSC)
Description
Highest altitude reached during the current Altimeter Mode
stopwatch session.
Lowest altitude reached during the current Altimeter Mode
stopwatch session.
Total cumulative ascent during the current Altimeter Mode
stopwatch session.
Total cumulative descent during the current Altimeter
Mode stopwatch session.
• The watch takes altitude readings and calculates data as described below,
and updates the current stopwatch session record accordingly. Note that
measurement and saves depend on whether or not the watch is in the
Altimeter Mode.
• In the Altimeter Mode
• Outside the Altimeter Mode
Readings are taken and session data is updated every two minutes.
Historical Record
The historical record keeps track of high altitude, low altitude, total ascent, and
total descent values across multiple Altimeter Mode stopwatch sessions. The
contents of this record are updated continually while an Altimeter Mode
stopwatch operation is in progress.
Altitude Measurement
Interval
0'05"
2'00"
First 3 minutes
Updated every 5
seconds
Updated every 5
seconds
After 3 minutes
Updated every 5 seconds
Updated every 2 minutes
How the historical record is updated
The watch performs the following operations continually while an Altimeter
Mode stopwatch operation is in progress.
Data
High Altitude
Low Altitude
Total Ascent
Total Descent
Update Operation
The historical record value is compared with the current
reading and the greater of the two is recorded in the
historical record.
The historical record value is compared with the current
reading, and the lesser of the two is recorded in the
historical record.
The current Altimeter Mode stopwatch session value is
added to the historical record value.
• See “Clearing the Historical Record” for information about clearing the
historical record, which restarts all data values from zero.
Other Altimeter Mode Features
This section explains other features and settings that are available in the
Altimeter Mode. Note that all of the information in this section applies to all
types of Altimeter Mode measurements, unless specifically indicated
otherwise.
Specifying a Reference Altitude
After you specify a reference altitude, the watch adjusts its air-pressure-to-
altitude conversion calculation accordingly. The altitude measurements
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 whenever one is available during your climb.