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2030-4
BACKLIGHT
The backlight uses an EL (electro-luminescent)
panel that causes the entire display to glow for
easy reading in the dark. The watch’s auto light
switch automatically turns on the backlight
when you angle the watch towards your face.
• The auto light switch must be turned on
(indicated by the auto light switch on
indicator) for it to operate.
• See “Backlight Precautions” for other
important information about using the
backlight.
Turning on the Backlight Manually
In any mode, press L to illuminate the display for about two seconds.
• The above operation turns on the backlight regardless of the current auto
light switch setting.
About the Auto Light Switch
Turning on the auto light switch causes the backlight to turn on for about two
seconds, whenever you position your wrist as described below in any mode.
Moving the watch to a position that is parallel to the ground and then tilting
it towards you more than 40 degrees causes the backlight to light.
Auto light switch on indicator
Parallel to
ground
More
than
40
°
Warning!
• Never try to read your watch when mountain climbing or hiking in areas
that are dark or in areas with poor footing. Doing so is dangerous and
can result in serious personal injury.
• Never try to read your watch when running where there is danger of
accidents, especially in locations where there might be vehicular or
pedestrian traffic. Doing so is dangerous and can result in serious
personal injury.
• Never try to read your watch when riding on a bicycle or when operating
a motorcycle or any other motor vehicle. Doing so is dangerous and can
result in a traffic accident and serious personal injury.
• When you are wearing the watch, make sure that its auto light switch
is turned off before riding on a bicycle or operating a motorcycle or
any other motor vehicle. Sudden and unintended operation of the
auto light switch can create a distraction, which can result in a traffic
accident and serious personal injury.
To turn the auto light switch on and off
In the Timekeeping Mode, hold down B for two seconds to turn the auto light
switch on (
displayed) and off ( not displayed).
• The auto light switch on indicator (
) is on the display in all modes
while the auto light switch is turned on.
REFERENCE
This section contains more detailed and technical information about watch
operation. It also contains important precautions and notes about the various
features and functions of this watch.
Moon Phase Indicator
The Moon phase indicator of this watch indicates the current phase of the
Moon as shown below.
• The light part of the Moon phase indicator shows the part of the Moon that
is visible in the sky during each particular phase.
• The Moon phase indicator shows the Moon as viewed at noon from a
position in the Northern Hemisphere looking south. Note that at times the
image shown by the Moon phase indicator may differ from that of the
actual Moon in your area.
Graph
Moon Age
Moon Phase
0, 1, 29 2–56–910–13 14–16 17–20 21–24 25–28
New
Moon
First
Quarter
(Waxing)
Full
Moon
Last
Quarter
(Waning)
• The left-right orientation of the Moon phase is reversed when viewing from
the Southern Hemisphere or from a point near the equator.
• The Moon phase indicator displayed in the Timekeeping Mode and Alarm
Mode is based on Timekeeping Mode (home site) data. The indicator
displayed in the Site Mode and Moon Data Mode is based on data for the
site that is currently selected in the Site Mode. There is no Moon phase
indicator in the Thermo Scanner Mode.
Moon Phases and Moon Age
The Moon goes through a regular 29.53-day cycle during which it appears to
wax and wane due to how the Sun illuminates the Moon and the relative
positioning of the Earth, Moon, and Sun. The greater the angular distance
between the Moon and the Sun,* the more we see illuminated.
*
The angle to the Moon in relation to the direction at which the Sun is visible
from the Earth.
The Moon age indicates the number of days from the New Moon to any
particular phase. It is normally calculated using either noon or midnight as a
reference point. This watch calculates the Moon age based on the angular
distance of the Moon at noon, which can result in an error of ±1 day. Because
of this, the appearance of the Moon phase indicator may be different from
that of the actual Moon.
The watch uses the following formula to calculate Moon age.
Moon Age (days) = 29.53 × (Moon angular distance / 360°)
Tide Graph
The black bar on the watch’s tide graph indicates the current tide.
• The tide graph displayed in the Timekeeping Mode and Alarm Mode is
based on Timekeeping Mode (home site) data. The graph displayed in the
Site Mode and Moon Data Mode is based on data for the site that is
currently selected in the Site Mode. There is no tide graph in the Thermo
Scanner Mode.
Tidal Movements
Tides are the periodic rise and fall of the water of oceans, seas, bays, and
other bodies of water caused mainly by the gravitational interactions between
the Earth, Moon and Sun. Tides rise and fall about every six hours. The tide
graph of this watch indicates tidal movement based on the Moon’s transit
over the meridian and the lunitidal interval. The lunitidal interval differs
according to your current location, so you must specify a lunitidal interval in
order to obtain the correct tide graph readings.
Lunitidal Interval
Theoretically, high tide is at the Moon’s transit over the meridian and low tide is
about six hours later. Actual high tide occurs somewhat later, due to factors
such as viscosity, friction, and underwater topography. Both the time differential
between the Moon’s transit over the meridian until high tide and the time
differential between the Moon’s transit over the meridian until low tide are
known as the “lunitidal interval.” When setting the lunitidal interval for this
watch, use the time differential between the Moon’s transit over the meridian
until
high
tide.
High tide High tideLow tide
Auto Return Features
• If you leave a screen with flashing digits or a cursor on the display for two
or three minutes without performing any operation, the watch automatically
saves anything you have input up to that point and exits the setting screen.
• If you leave the watch in any mode for about three minutes without
performing any operation, it automatically changes to the Timekeeping
Mode.
Data and Setting Scrolling
The B and D buttons are used in various modes and screens to scroll
through data on the display. In most cases, holding down these buttons
during a scroll operation scrolls through the data at high speed.
12-hour/24-hour Timekeeping Formats
The 12-hour/24-hour timekeeping format you select in the Timekeeping Mode
is also applied in all modes.
• With the 12-hour format, the P (PM) indicator appears to the left of the hour
digits for times in the range of noon to 11:59 p.m. and the A (AM) indicator
appears to the left of the hour digits for times in the range of midnight to
11:59 a.m.
• With the 24-hour format, times are indicated in the range of 0:00 to 23:59,
without any indicator.