2. Altitude Mode
2.1 Absolute altitude
As the absolute altitude is calculated from the air pressure the change of air pressure would
affect
the
altitude
reading.
To
achieve
a
more
accurate
reading,
it
needs
to
be
calibrated
as
pressure
may
change
gradually.
Important
note:
In
order
to
set
the
correct
absolute
altitude
reading,
the
altitude
must
be
known.
That
information
can
be
found
by
utilizing
a
topographical
map
identifying
the
current
location
with
the
associated
altitude
marked.
The
user
can
then
proceed
and
follow
the
instructions
to
calibrate
the
absolute
altitude.
To calibrate
the
absolute
altitude
In
absolute
altitude
display
mode,
hold
the
“SET”
button
for
2s
to
enter
setting
mode,
press
“SET”
button
to
select
the
absolute
altitude
setting.
While
the
digits
are
selected
(flashing),
press
the
“ALTITUDE”
button
to
increase
the
digit
amount.
Press
“COMPASS”
button
to
decrease
the
digit
amount.
2.2
Relative
altitude
Relative
altitude
can
be
set
whenever
required
over
the
whole
measurement
range.
To
set
the
relative
altitude
to
zero
While
in
absolute
altitude
display
mode,
hold
the
“AL”
button
for
2s,
the
absolute
altitude
will
be
reset
to relative
altitude
and
the
initial
value
is
zero.
3.SET
Mode
-
Hold
the
“SET”
button
for
2s
while
in
normal
display
to
enter
setting
mode
-
Press
“
SET”
button
to
select
the
following
setting
in
sequence:
12/24
hour
format
Manual
time
setting
(hours/minutes)
Calendar
setting
(year/month/date
Temperature
display
unit
degree
Celsius
or
Fahrenheit
Pressure
display
unit
in
hPa
or
mmHg
or
inHg
Altimeter
display
unit
in
m
or
feet
Absolute
altitude
calibrate
In
the
above
setting
modes,
press “ALTITUDE”
button
or
“COMPASS”
button
to
change
or
scrolls
the
value.
Hold
the “ALTITUDE”
button
or
“COMPASS”
button
for
3
second
will
increase/decrease
digits
in
great
steps.
Press
the
“SET”
button
to
accept
the
change
and
advance
to
the
next
setting
mode.
Continue
to
press
the
“SET”
button
to
toggle
through
the
setting
mode
until
return
to
the
normal
Mode
4.
COMPASS
Mode
4.1
Precautions
when
using the
Compass
3
