National Geographic NG770C User manual

WATCH COLLECTION
NG770C / NG770D /
NG771D
INSTRUCTION
MANUAL
2

Dear Customer,
By purchasing this radio-controlled wristwatch, you have become the
owner of a timepiece equipped with the very latest technology. It is
operated simply with a corrector and a push button. The additional
"manual start" function allows you to change the battery even when you
are outside the transmitter range. Please keep these instructions in a
safe place for ready reference.
1

GENERAL INFORMATION
In addition to the hour and minute hands, your watch displays the
seconds digitally on the left-hand side of the LCD. Steady display of the
radio tower symbol indicates that your watch is showing the exact
radio-controlled time. The number to the right of the radio towers is the
reception indicator. It shows how many days have elapsed since your
watch last had contact with the DCF transmitter. Therefore, a "0" means
that there are ideal reception conditions.
CHANGING THE LCD
If you press the push button (recessed right-hand button) with a pointed
object briefly, the display changes from seconds to date (day/month).
When you press the push button with a pointed object a second time,
the display returns to the seconds with radio tower symbol and
reception indicator.
Corrector
Hour hand
Push button
Minute hand
Date
Seconds
reception indicator
Speed index
Outer scale
Inner scale
2

TIME ZONE SELECTION
Press the corrector (left-hand recessed button) briefly with a pointed
object. The number on the LCD now shows the hour. Each subsequent
brief press on the corrector increases the hour by one, i.e., one time
zone farther east. At the same time, the hands also move forward by
one hour. From the 11th time you press the corrector, you start returning
toward the current Central European Time from the westerly direction
(apparently backward) in hourly steps. For example, in the case of
Great Britain, which is one hour behind the DCF time, you must press
the corrector 23 times. If you press it slowly, the hands will adjust
themselves in unison. But if you press the corrector in very rapid
succession, the hands may only move 11 hours instead of 23. This
does not mean that your watch is malfunctioning. Nine seconds after
you last press the corrector, the LCD returns to the normal display of
seconds and date (adjusted to the new time zone). Instead of waiting
for nine seconds, you can also finish the time zone selection
immediately by briefly pressing the push button (on the right). To return
to the DCF time (after changing a time zone), press the corrector (on
the left) for longer than three seconds. Your watch then automatically
sets itself to the DCF time. Due to the internal time memory, this is also
possible at any time when traveling abroad, even outside the
transmitter range.
Note: The manual transmitter call (refer to next section) and automatic
reception (radio tower symbol and reception indicator both flash) are
not possible if you have set a time zone beyond the DCF time plus or
minus one hour. This limitation saves the battery.
3

TRANSMITTER CALL
Press the push button (on the right) for longer than three seconds. The
seconds display jumps to "00." The hands move at high speed to the 12:00
position and remain there. If they do not reach this precise position, first
follow the instructions under "Positioning the hands." If the hands do
immediately reach the exact 12:00 position, keep your watch still
(preferably lay it on a non-metal surface) to ensure reliable reception. The
radio tower symbol and reception indicator both flash and the seconds
display begins to count. After a few minutes, your watch automatically sets
all the current time information and the transmitter call is then complete.
You can interrupt the transmitter call prematurely by briefly pressing the
push button (on the right). The time stored in the watch’s memory is then
displayed.
Positioning the hands
The hands have not reached the exact 12:00 position. Now press the
corrector (left-hand side). The LCD shows "Po 0" (zero position of the
hands). This message means that you must continue pressing the corrector
(left-hand side) until the hands are exactly in the 12:00 position. When
doing so, a brief press moves the hands in small individual steps, and
continuous pressure makes the hands move at high speed. Once the
correct position is reached, you must finish the positioning process by
briefly pressing the push button (right-hand side). Everything else takes
place automatically, as if the hands had moved immediately to the exact
12:00 position as described in the "Transmitter Call" section.
Error Information
If, by mistake, you press both the corrector and push button simultaneously
for longer than three seconds, the microprocessor sets a hardware reset.
All previous time information is then lost. In this case, follow the instructions
4

NEW START AFTER BATTERY CHANGE
The LCD shows "Po 0." You must first move the hands to the exact
12:00 position with the corrector (left-hand side) and finish with the
push button (right-hand side), as described in the section "Positioning
the Hands." Then, if the reception conditions are good, everything else
takes place automatically, as described in the section "Transmitter
Call." After your watch has received the transmitter signal for a few
minutes, it displays the correct time and date. If conditions are bad, or
your location is outside of the transmitter range, your watch will not be
able to receive the transmitter signal completely and no time
information will be displayed. In this case, the software enables you to
carry out a manual start (next section).
MODE "Po 0" – MANUAL START
After positioning the hands as described in the previous section, press
the corrector (left-hand side) briefly. The minutes are displayed on the
LCD. If you continue to press the corrector (left-hand side), the LCD
minutes and hands will be adjusted (brief press = step-by-step
adjustment; continuous pressing = high-speed adjustment). In this way,
you can synchronize your watch with another clock or watch, pressing
the corrector for the last time on the minute. Finish the manual start by
briefly pressing the push button (right-hand side). A steady "1" is
displayed next to the LCD seconds to indicate the manual start. The
radio tower symbol is not visible. In manual start mode your watch
attempts to receive the transmitter signal every hour. A transmitter call
is also possible, but should only be carried out when you are within the
transmitter range. After successful reception, your watch automatically
displays the radio-controlled time (radio tower symbol is visible).
5

AUTOMATIC FUNCTIONS OF YOUR WATCH
Synchronization accurate to the second
During the night, your watch’s receiver is switched on at 2:00, 3:00, and
if required at 4:00, 5:00, and 6:00 a.m. and the internal time memory is
synchronized by radio signal accurately to the second. At these switch-
on times the radio tower symbol flashes. If all automatic attempts to
receive the radio signal fail to produce exact synchronization, the
number in the reception indicator moves up by one. Days in which there
is no reception are added together. On such days, your watch still
operates very accurately on the quartz time base due to the internal
time memory. The next time that a successful reception makes
synchronization possible, the reception indicator is reset to zero.
Changeover from summer time to winter time and vice versa
If reception conditions are good, your watch changes from standard
time to daylight savings time, or vice versa at 2 a.m. or 3 a.m. If the
interface prevents reception, the changeover may be delayed until later
in the morning.
Battery change indicator
If the second display or date display flashes, this indicates that the
battery voltage has dropped below 2.4 V. All watch functions still
operate normally; however, the battery should be changed within the
next few weeks.
6

GENERAL INFORMATION
• Servicing, such as repairs to the crystal, seal, or wrist strap,
should only be carried out by a specialist watch retailer.
• Seals and crystal should be inspected by an expert at regular
intervals, approximately every two years.
• If condensation gets into the watch, have it inspected by
Customer Service without delay. Penetration of moisture may
damage the watch.
• Your watch is fitted with a quality wrist strap that has undergone
multiple inspections at the factory. If, however, you decide to
change the wrist strap, fit a new one of the same quality,
preferably an original Eurochron wrist strap.
• Clean your watch and wrist strap with a dry or slightly moist, soft
cloth. Caution: Do not use chemical cleaners (e.g., benzine or
paint thinners) as these may harm the surface.
7

TECHNICAL DATA
Reception frequency 77.5kHz, amplitude
modulated, DCF coding
Transmitter range (receiver sensitivity) 1,500 km radius of Frankfurt am
Main
Quartz time base 32 kHz
Battery type Li CR 1620 (3 V / 75 mAh)
Operating voltage range 2.4 V to 3.4 V
Battery life (normal use) 4 years
Time zone adjustment range Worldwide
Operating temperature range -5°C to + 55°C
Storage temperature range -20°C to + 70°C
Water-resistance 10 ATM, 100 m
8

USING SLIDE RULE
This rule is good for…
Multiplication Division
Proportion Square root
Time required Fuel consumption
Estimated flight time Other flying problems
Note: Use the control turning bezel located above the crown to move
the outer scale. This scale cannot place a decimal point; therefore,
the calculation of this watch should be used as a guide only.
(1) Time Required
Example: Obtain the time required for the flight of an aircraft at 180
knots for 450 nautical miles.
Operation: Align "18" on the outer scale with the SPEED INDEX on
the inner scale. Then, "45" on the outer scale corresponds to "150.1"
on the inner scale (time scale). Thus, the time required for the flight
is 2 hours and 30 minutes.
9

(3) Flight Distance
Example: Obtain the air distance when the air speed is 180
knots and the flight time is 40 minutes.
Operation: Align "18" on the outer scale with the SPEED INDEX
on the inner scale. Then "40" on the inner scale corresponds to
"12" on the outer scale. Thus, the air distance of the flight is 120
nautical miles.
(4) Rate of Fuel Consumption
Example: Obtain the rate of fuel consumption (gallons/hour)
when the flight time is 30 minutes and the fuel consumption is
130 gallons.
Operation: Align "13" on the outer scale with "30" on the inner
scale. Then the SPEED INDEX on the inner scale corresponds
to "26" on the outer scale. Thus, the fuel consumption is 260
gallons an hour.
(2) Knots (Air Speed)
Example: Obtain the knots (air speed for 240 nautical miles with
a flight time of 1 hour and 20 minutes.
Operation: Align "24" on the outer scale with "80" on the inner
scale (time scale). Then, the SPEED INDEX on the inner scale
corresponds to "18" on the outer scale. Thus, the air speed for
the flight is 180 knots.
10

(6) Estimated Flight Time
Example: Obtain the estimated flight time when the fuel
consumption is 260 gallons an hour and the aircraft has 650
gallons of fuel.
Operation: Align "26" on the outer scale with the SPEED INDEX
on the inner scale. Then, "65" on the outer scale corresponds to
"150" on the inner scale (time scale). Thus, the estimated flight
time is 2 hours and 30 minutes.
(7) Difference in Altitude
The difference in altitude can be obtained from the rate of descent
and the descent time.
Example: Obtain the difference in altitude when an aircraft
continues descending for 20 minutes at a rate of 430 feet a
minute.
Operation: Align "43" on the outer scale with "10" on the inner
scale. Then, "20" on the inner scale corresponds to "86" on the
outer scale. Thus, the difference in altitude is 8,600 feet.
(5) Fuel Consumption
Example: Obtain the fuel consumption required for a flight when
the fuel consumption is 236 gallons an hour and the flight time is 9
hours.
Operation: Align "23.6" on the outer scale with the SPEED INDEX
on the inner scale. Then, "9:00" on the inner scale (time scale)
corresponds to "35" on the outer scale. Thus, the fuel consumption
is 3,500 gallons.
11

(8) Rate of Climb (or Descent)
The rate of climb (or descent) can be obtained from the time
required to reach an altitude.
Example: Obtain the rate of climb when an aircraft reaches an
altitude of 7,500 feet after climbing for 25 minutes.
Operation: Align "75" on the outer scale with "25" on the inner
scale. Then, "10" on the inner scale corresponds to "30" on the
outer scale. Thus, the rate of climb is 300 feet a minute.
(9) Time of Climb (or Descent)
The time required for climb can be obtained from the altitude to be
reached and the rate of climb (or descent).
Example: Obtain the time of climb when an aircraft is to climb to
6,300 feet at a rate of 390 feet a minute.
Operation: Align "39" on the outer scale with "10" on the inner
scale. Then, "63" on the outer scale corresponds to "16" on the
inner scale. Thus, the time of climb is 16 minutes.
12

(11) Multiplication
Example: 39 X 20
Operation: Align "39" on the outer scale with "10" on the inner
scale. Then, "20" on the inner scale corresponds to "78" on the
outer scale. Take into account the position of the decimal point
and add one zero to obtain 780. Note that with the watch scales,
the position of the decimal point cannot be obtained.
(12) Division
Example: 900/47
Operation: Align "90" on the outer scale with "47" on the inner
scale. Then, "10" on the inner scale corresponds to "19.1" on the
outer scale. Take into account the position of the decimal point to
obtain 19.1.
(10) Conversion
Example: Convert 45 statute miles into nautical miles and
kilometers.
Operation: Align "45" on the inner scale with STAT on the outer
scale. Then, NAUT on the outer scale corresponds to "39" nautical
miles on the inner scale and "KM" on the outer scale corresponds
to "72" on the inner scale.
13

(14) Square Root
Example: Square root of 900
Operation: Turn the outer scale slowly and find a value that
corresponds to both 90 on the inner scale and 10 on the outer
scale. In this example, "90" on the inner scale corresponds to
"30" on the outer scale and "10" on the outer scale corresponds
to "30" on the inner scale, thus the answer is 30.
(15) Currency Operation
Example: Convert 35 Swiss Franc (CHF) into Euro. The
exchange rate is 1.4 CHF to 1 Euro, therefore 14 CHF converts
to 10 Euro.
Operation: Align "14" on the outer scale with "10" on the inner
scale. Then, "35" on the outer scale corresponds to "25" on the
inner scale. Thirty-five CHF is the equivalent to 25 Euro. All
values on the inner scale correspond with the outer scale; CHF
to EUR (or other currency).
(13) Proportion
Example: 30/10 = 60/x
Operation: Align "30" on the outer scale with "10" on the inner
scale. Then, "60" on the outer scale corresponds to "20" on the
inner scale. At this point the proportion for every value and the
inner and outer scales is 30:10.
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