Calibrating Altitude Readings; Taking A Relative Altitude Reading From Some Reference Point - Casio 5470 Operation Manual

Calibrating Altitude
Readings
To minimize the difference between locally
indicated and measured values, you should
update the reference altitude value before
setting off on and during treks or any other
activities where you take altitude readings.
You can find out the altitude at your current
location from signs, maps, on the Internet, etc.
While mountain climbing, it is highly
recommended that you check a map, local
altitude indications, or some other source for
your current location's altitude and regularly
calibrate watch readings with the latest
information.
Differences between actual altitude and
●
watch readings can be caused by the
factors below.
Changes in barometric pressure
ー
Changes in temperature caused by
ー
variations in barometric pressure and by
elevation
Though altitude readings can be taken
●
without calibration, doing so may produce
readings that are very different from
indications by altitude markers, etc.
1.
Pull out the crown.
2.
Rotate the crown to calibrate the
displayed value to that of a local altitude
(elevation) marker.
Calibration unit: 1 m (5 feet)
To return the altitude setting to its initial
●
factory default, press (A) and (C) at the
same time.
3.
Push the crown back in to complete the
setting operation.
Operation Guide 5470
Taking a Relative Altitude
Reading from Some
Reference Point
After you set a reference altitude, the second
hand of the watch will indicate the difference
between your current altitude and the
reference altitude. This makes it easy to
measure the altitude different between two
points while climbing or trekking.
Setting the Altitude Differential
●
Measurement Range
1.
Pull out the crown.
2.
Press (B) twice.
3.
Rotate the crown to select either [100m] or
[1000m].
[100m]: ±100 m (±328 feet) in 5 m (16 feet)
Crown
units
[1000m]: ±1000m (±3280 feet) in 50m
(164 feet) units
4.
Push the crown back in to complete the
setting operation.
Measuring Altitude
●
1.
Use the contour lines on your map to
determine the difference in altitude
between your current location and your
destination.
2.
Take an altitude reading of your current
location.
Checking the Current Altitude
l
3.
Hold down the (D) button for about two
seconds to set your current location's
altitude as the reference altitude.
[DIFF RESET] and [RESET] will appear
on the display, followed by the current
altitude.
The second hand (Altitude Differential
●
Indicator) will indicate the difference
between the reference altitude and the
current altitude reading. At this time the
second hand should indicate ±0 m (±0
feet).
Crown
4.
While comparing the difference between
the altitude you found on the map and the
altitude differential indicated by the
watch's second hand, advance towards
your destination.
When the altitude differential you found
●
on the map is the same as that indicated
by the second hand, it means you are
close to your destination.
Example: Altitude differential of -30 m (-98
feet) (-300 m (-984 feet))
Unit: m
100
−100
5.
To exit the altitude differential indication,
press (D).
The second hand indicates the current
time seconds.
To toggle the second hand between
●
altitude differential and current time
seconds indication, press (D).
Altitude Differential Indicator
Current location altitude
50
Range: ±100 m (1000 m)
0
(±328 feet (3280 feet))
Altitude Differential
−50
Indicator
11