Moon Phase Indicator; Tide Graph - Casio Pathfinder SPF40 User Manual

Moon Phase Indicator

The Moon phase indicator of this watch indicates the current phase of the
Moon as shown below.
Graph
Moon Age 0, 1, 29 2–5 6–9
New First
Moon Phase
Moon Quarter
(Waxing)
• 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.
• The left-right orientation of the Moon phase is reversed when viewing from
the Southern Hemisphere or from a point near the equator.
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.
This watch perform a rough calculation of the current Moon age starting from
day 0 of the moon age cycle. The actual Moon age average cycle is 29.53
days, but this can vary anywhere from –1 day to +1 day for specific months.
Since this performs calculations using integer values only (no fractions), the
margin for error of the displayed Moon age is ±2 days.

Tide Graph

The black bar on the watch's tide graph indicates the current tide.
High tide
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.
Warning Indicators
Warning indicators appear whenever any of the conditions described below
occur. Appearance of a warning indicator causes any measurement operation
that is currently underway to stop. Warning indicators appear in the upper
display area, and this causes
or barometer values on the display.
Abnormal Magnetic Field Indicator
This indicator appears whenever the watch
has a problem obtaining a correct direction
reading. This condition could indicate that the
watch is within a very high magnetic field, and
so you should try moving to another location.
Also, see "Digital Compass Precautions" for
further information on conditions that cause
errors.
Low Battery Indicator
This message indicates that battery power is
too low to perform the measurement. It
appears whenever battery power drops below
a certain level, or when you try to perform a
measurement under very cold conditions
(below about –10°C/14°F).
10–13 14–16 17–20 21–24 25–28
Last
Full
Moon Quarter
(Waning)
Low tide High tide
to replace any directional, temperature,
If the cause of the low battery indicator is due to use under cold conditions,
normal operation should return after the watch is brought back to normal
temperature.
If the cause of the low battery indicator is due to low battery power (indicated
when and
you should have the watch's batteries replaced as soon as possible.
Sensor Malfunction Indicator
This message flashes on the display to
indicate malfunction of pressure sensor
circuitry.
Note that calibrating the Digital Compass can
also cause the
this case, the message does not indicate
sensor malfunction, and the condition should
be corrected when you re-calibrate the Digital
Compass.
Important!
• If a sensor malfunctions or if battery power is low when it comes time for a
measurement to be taken, the measurement value appears as
the display. In the case of barometric pressure measurement, the
corresponding point on the barometric pressure graph is left blank.
• There may be cases where the
(low battery) message disappears from the display when
you change modes. In this case, you can continue using the watch
normally unless the warning indicator reappears.
Whenever you have a sensor malfunction, be sure to take the watch back
to the store or dealer where you purchased it.
Auto Return Features
• If you leave the watch in the Digital Compass or Barometer/Thermometer
Mode, for 1 to 2 hours without performing any operation, the watch
automatically returns to the Timekeeping Mode.
• If you leave a screen with flashing digits 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.
Setting Scrolling
The E and B buttons are used in various setting 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.
Timekeeping
• The day of the week is automatically displayed in accordance with the date
(year, month, and day) settings.
• The year can be set in the range of 2000 to 2039. Going past December
31, 2039 reverts to January 1, 2000.
• The watch's built-in full automatic calendar automatically makes
allowances for different month lengths and leap years. Once you set the
date, there should be no reason to change it except after you have the
watch's batteries replaced.
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 no 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 displayed in the range of 0:00 to 23:59,
without any indicator.
Backlight Precautions
• The electro-luminescent panel that provides illumination loses power after
very long use.
• The illumination provided by the backlight may be hard to see when viewed
under direct sunlight.
• The watch will emit an audible sound whenever the display is illuminated.
This is due to vibration of the EL panel used for illumination, and does not
indicate malfunction.
• The backlight automatically turns off whenever an alarm sounds.
• The backlight remains lit for about one second from the point you press the
button, even if it is already lit when you press the button. If you keep the
button depressed for one second or more, the backlight automatically turns
off.
• Frequent use of the backlight shortens the battery life.
2273-7
appears under normal temperatures),
message to appear. In
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(sensor malfunction) or
on