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E-40
Checking the Latest Changes in Altitude
The altitude differential graph shows the difference between the currently displayed altitude reading
and the previous reading during while readings are being taken automatically.
0
–30m
+30m
+10m +20m
+18m
31 meters or greater
–4m
–10m –20m
No
difference
Example
E-41
The altitude tendency graph shows changes in altitude over the past 20 readings while readings are
being taken automatically.
80 meters
(10 meters for
each block )
20 readings
ago
10 readings
ago
Current
reading
Advanced Altimeter Mode Operations
Use the information in this section to obtain more accurate altimeter readings, especially while mountain
climbing or trekking.
E-42
Using an Altitude Differential Value
The Altimeter Mode screen has an altitude differential value that shows
the change in altitude from a reference point you specify. The altitude
differential value is updated each time the watch takes an altitude reading.
The range of the altitude differential value is –3,000 meters (–9,995
feet) to 3,000 meters (9,995 feet).
- - - -
is displayed in place of the altitude differential value whenever
the measured value is outside the allowable range.
See “Using the Altitude Differential Value While Mountain Climbing or
Hiking” (page E-43) for some real-life examples of how to use this
feature.
To specify the altitude differential start point
1. In the Altimeter Mode, select Screen 2 as the Altimeter Mode display
(page E-37).
2. Press
A
.
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.
Altitude differentialAltitude differential
Altitude differentialAltitude differential
E-43
Using the Altitude Differential Value While Mountain Climbing or Hiking
After you specify the altitude differential start point while mountain climbing or hiking, you can easily
measure the change in the altitude between that point and other points along the way.
To use the altitude differential value
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
C
to take one. See “To
take altitude readings” (page E-39) 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
A
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.
Current
location
Destination
altitude
Current
location
Destination
altitude
Altitude
Altitude
differential
Altitude
Altitude
differential
E-44
Using Reference Altitude Values
To minimize the chance of reading error, you should update the reference altitude value before setting off
on a trek or any other activity where you plan to take altitude readings. During a trek, keep checking the
readings produced by the watch against altitude information provided by markers and other information,
and update the reference altitude value as required.
Reading error can be caused by changes in barometric pressure, atmospheric conditions, and
elevation.
Before performing the procedure below, look up the altitude of your current location on a map, the
Internet, etc.
To specify a reference altitude value
1. In the Altimeter Mode, hold down
E
for at least two seconds. You can
release
E
after
ALTI
appears.
The current altitude reading value will appear at this time.
2. Use
A
(+) or
C
(–) to change the current reference altitude value in
1-meter (5-foot) increments.
Change the reference altitude value to an accurate altitude reading
that you get from a map or other source.
You can set the reference altitude value within the range of –10,000
to 10,000 meters (32,800 to 32,800 feet).
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.
3. Press
E
to exit the setting screen.
E-45
Types of Altitude Data
Your watch stores two types of altitude data: altitude records and historical altitude values.
Manually Saved Records
Each altitude reading you take manually is stored along with the date and time of the reading as an
“altitude record”. You can later recall an altitude record to view it.
Important!
The watch has memory for storage of up to 40 records of various types. If you perform an operation
that creates a new record while there are already 40 records in memory, the oldest record is deleted
automatically to make room for the new one (page E-70). Note that altitude differential graph and
altitude tendency graph information is not stored as part of an altitude record.
To save a reading manually
1. In the Altimeter Mode, hold
C
for at least two seconds.
REC
and
Hold
will appear on the display fi rst, and then
Hold
will
disappear. Release
C
after
Hold
disappears.
The watch will create a record of the current altitude reading along
with the date and time, and then return automatically to the altitude
reading screen.
2. To view a record, enter the Data Recall Mode (page E-26) and use the
A
and
C
buttons to scroll. See “Viewing Memory Records” (page
E-70) for more information.
E-46
Auto Save Values
The watch automatically keeps track of the four types of values below, and updates them as required
along with the time and date of the reading.
High Altitude (MAX)
Low Altitude (MIN)
Cumulative Ascent (ASC)
Cumulative Descent (DSC)
For detailed information about each value, see page E-47.
For information about viewing these values, see “Viewing Memory Records” (page E-70).
These values are checked and updated automatically by the watch as altitude auto measurements are
taken. You can change the auto save interval, if you want (page E-37).
Auto save is performed only while the watch is in the Altimeter Mode.
E-47
How Cumulative Ascent and Cumulative Descent Values Are Updated
Session start point
20 m
0 m
120 m
320 m
620 m
Session end point
The total ascent and total descent values produced by an Altimeter Mode reading operation session
during the example climb illustrated above are calculated as follows.
Total Ascent:
q
(300 m) +
e
(620 m) = 920 m
Total Descent:
w
(320 m) +
r
(500 m) = 820 m
Cumulative ascent and cumulative descent values are updated whenever there is a difference of at
least ±15 meters (±49 feet) from one reading to the next.
ASC
and
DSC
values are retained in memory without being reset even if you exit the Altimeter Mode.
When you re-enter the Altimeter Mode, accumulation resumes from the value where it last stopped. See
page E-74 for information about how to reset the
ASC
and
DSC
values to zero.
Operation Guide 3410
6


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