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Citizen Watch H461

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English
LThis watch indicates the reception level and reception result with the shorter end of the second hand.
Second hand Hour hand Minute hand Button (B) 0: Indicated when no time difference has been set Crown
WThis watch is a radio wave watch that W
receives the standard time radio wave transmitted in Germany.
This radio wave watch is equipped with a regular automatic reception function that sets the time and date by automatically receiving radio waves twice a day at 3:00 AM and 4:00 AM, and a free reception function that allows the time to be set arbitrarily by receiving radio waves. A time difference can also be set in 1 hour units based on German standard time.
Crown for turning the outer scale
SET: Indicated when a time difference has been set Button (A) H,M,L: Reception level/ Reception result Shorter end of second hand No: Reception result RX:Reception standby (start of radio wave reception)
The design may differ according to the model.
This watch only receives the standard time radio wave transmitted in Germany during radio wave reception. It is unable to receive radio waves of countries other than Germany. When using the watch in a location that has a different time difference than that of Germany, set the time difference by referring to the section entitled, 5. Time Difference Correction Function. If the standard time radio wave transmitted in Germany is received after setting the time difference by another method, the time will return to German standard time.
WPlease use this watch afterW charging sufficiently by placing in light.
If the second hand of the watch is moving at two-second intervals while the watch is in use, this indicates that the watch is insufficiently charged. Use the watch after first recharging by placing the watch under direct sunlight for about 8 hours. To ensure that this Eco-Drive Radio Wave Watch is used comfortably without stopping, it is recommended to try to keep the watch fully charged at all times.
WPlease confirm the following before usingW the watch.
Check the movement of the second hand.
Second hand moving at 1second intervals
Check the reception result.
Press button (A) (located at the 4:00 position) once.
When the shorter end of the second hand has pointed to a reception result (H, M, L)
The standard time radio wave has been received properly. The watch can now be used.
Second hand moving at 2-second intervals

Button (A)

H,M,L: Reception level / reception result
RX:Reception standby NO: Reception result
Recharge the watch by placing under direct sunlight
When the shorter end of the second hand has pointed to reception result (NO)
Second hand moving at 1-second intervals
Perform radio wave reception by referring to Free Receptiondescribed in the section on Important Points Regarding Radio Wave Reception.
WImportant Points Regarding Radio Wave ReceptionW
The two ways to receive radio waves that are ordinarily used consist of Regular Automatic Reception and Free Reception. When receiving radio waves, first remove the watch from your wrist, face the 9:00 position on the watch towards the radio wave transmitter station, and place the watch in a stable location that facilitates reception of radio waves such as in front of a window. Since the watch uses a directional antenna, moving the watch while reception is in progress may prevent radio waves from being properly received. When reception is completed, the second hand returns to one-second interval movement. Do not move the watch until radio wave reception is completed.
[Regular Automatic Reception]
The watch sets the time and date by automatically receiving radio waves at the predetermined times of 3:00 AM and 4:00 AM each day.
<Confirmation of Reception>
Check the reception result to determine whether or not radio waves have been received properly by pressing button (A) located at the 4:00 position once. If the shorter end of the second hand points to H, M or L, this indicates that radio waves have been received properly. The watch can now be used. If the shorter end of the second hand points to NO at the 5:00 position, this means that radio waves were unable to be received properly. If this happens, perform radio wave reception using the Free Reception function.

[Free Reception]

The Free Reception function lets you receive radio waves at any time. Use this function when the reception environment has changed or in other cases when radio waves are unable to be received by Regular Automatic Reception.

<Reception Procedure> (1) Press button (A) located at the 4:00 position for about 2 seconds, and then release the button after the shorter end of the second hand has moved to the RX (6:00) position. (2) The shorter end of the second hand then moves to H, M or L indicating that reception is in progress. (3) When reception is completed, the shorter end of the second hand moves from H, M or L and returns to one-second interval movement.
[Reception Standby] [Reception in Progress] [Reception Completed]
WWhen Storing in a Dark Location for a Long Period of TimeW
If the watch is stored in a location out of the light for a period of one week or more, the Power Save Function of the watch is activated and the watch stops. Even though the watch is in the Power Save mode, it still continues to perform Regular Automatic Reception and the watch continues to keep the correct time internally. However, the time may not be able to be corrected as a result of being unable to receive radio waves depending on the manner in which the watch is stored. When resuming use of the watch after storing for an extended period of time, cancel the Power Save function by placing the watch in the light and then perform Free Reception to correctly set the time and date. * Refer to 7. A. Power Save Function for information on the Power Save function.

RX (Reception Standby)

Reception level (H, M, L)
Second hand returns to onesecond interval movement
* Refer to 3. Receiving Radio Waves for further details on the procedure for receiving radio waves.

CONTENTS

1. Features....15 2. Before Using....16 A. Radio Wave Receiving Function <For Good Reception> <Locations where Reception may be Difficult> 3. Receiving Radio Waves....18 A. Reception Modes B. Position of the Shorter End of the Second Hand during Reception C. Confirmation of Reception Result D. Reception Level and Reception Result E. General Reference for Receiving Areas 4. Manually Setting the Time and Date..27 <Screw-Lock Type Crown> A. Correcting the Second Hand and Minute Hand 5.
B. Correcting the Month and Year (No. of Years Since Leap Year) C. Correcting the Hour Hand and Date Time Difference Correction Function...38 <Time Difference Setting Procedure> <Setting the Time Difference in the Case> <Confirmation of Time Difference Setting> <Canceling Time Difference> Solar-Powered Watch Handring Notes...45 <For Optimum Use of this Watch> <Try to Keep the Watch Charged at all Times> Unique Functions of Solar-Powered Watches..46 A. Power Save Function <Power Save> <Canceling Power Save> B. Insufficient Charge Warning Function C. Overcharging Prevention Function General Reference for Charging Times of Solar-Powered Watches.52

9. Solar-Powered Watch Handling Precautions...54 10. Setting the Reference Position...56 A. Checking the Reference Position B. Setting the Reference Position <Changing the Mode when Setting the Reference Position> 11. All-Reset....60 A. All-Reset Procedure B. Setting the Reference Position after All-Reset 12. Troubleshooting....64 13. Using the Slide Rule....66 14. Precautions....78 15. Specifications...84

1. Features

This watch is a radio wave watch that automatically corrects the time and date by receiving a standard time radio wave (time information) transmitted in Germany. It is also equipped with a time difference setting function that allows time differences to be set in one hour units based on German standard time when the watch is used in regions where the time difference differs from that of Germany. In addition, this watch is also an Eco-Drive radio wave watch provided with a photoelectric power generation function that converts light energy into electrical energy to drive the watch. It is also equipped with a power save function that reduces power consumption of the watch when the solar cell is not exposed to light.

2. Before Using

A. Radio Wave Receiving Function
<For Good Reception> This watch incorporates an antenna for receiving radio waves inside the watch case (at the 9:00 position). For good reception, it is ideal to have the 9:00 position of the watch facing in the direction of the radio wave transmitter station when receiving radio waves. The reception level varies depending on the environment in which the watch is used. Try receiving radio waves while changing the orientation or location of the watch while referring to H, M or L that indicates the reception level of the watch. Find the location and direction where radio waves are received easily as indicated by H or M being indicated for the reception level.
For stable reception, remove the watch from your wrist and place the watch in a stable location that facilitates reception of radio waves such as in front of a window. Do not move the watch during reception. Radio waves may be hard to receive due to blockage by metallic objects or the environment. When inside a building and so on, reception should be performed as close to a window as possible.

<Locations where Reception may be Difficult> It may not be possible to properly receive radio waves at the following locations susceptible to generation of radio wave noise or under the following environmental conditions that cause difficulty in receiving radio waves. (1) Locations subject to extremely high or low temperatures (2) Inside a reinforced concrete building, between tall buildings or in valleys between mountains or underground (3) In a car, train or airplane (4) Near high-tension wires (power lines), railroad overhead wires or airports (communication facilities) (5) Near a cellular telephone in use (6) Near household electric appliances or OA equipment such as TV sets, refrigerators, personal computers, fax machines, etc.

3. Receiving Radio Waves

In addition to the most commonly used Regular Automatic Reception and Free Reception, radio waves can also be received by using Recovery Automatic Reception by which radio waves are received when the watch is charged until the second hand moves at one-second intervals after having stopped due to being insufficiently charged. The time and date are corrected automatically when radio waves have been properly received. When reception is completed, each hand either moves forward or backward to indicate the received time. [Data Received from German Standard Time Radio Waves] Time information: Hours, minutes, seconds, daylight savings time Date information: Month, day, year
the direction of the radio wave transmitter station. The watch automatically receives radio waves twice a day at 3:00 AM and 4:00 AM.
2. Free Reception Reception begins when button (A) at the 4:00 position is pressed for about 2 seconds. Remove the watch from your wrist and place it in a stable location where radio waves can be received easily such as by a window with the 9:00 position of the watch facing in the direction of the radio wave transmitter station. When reception is completed, the second hand returns to one-second interval movement. Do not move the watch until reception is completed.
<Reception Procedure> (1) Press button (A) located at the 4:00 position for about 2 seconds and then release. Confirm that the shorter end of the second hand has moved to the RX: Reception Standby position (6:00 position). (2) Place the watch in a stable location where radio waves can be received easily such as by a window with the 9:00 position of the watch facing in the direction of the radio wave transmitter station. (3) After that, the shorter end of the second hand moves from the RX position to H, M or L indicating that reception is in progress.

A. Reception Modes

1. Regular Automatic Reception The shorter end of the second hand moves to the RX: Reception Standby position and the watch automatically begins to receive radio waves twice a day at 3:00 AM and 4:00 AM. <Reception Procedure> Remove the watch from your wrist and place it in a stable location where radio waves can be received easily such as by a window with the 9:00 position of the watch facing in

(4) When reception is completed, the shorter end of the second hand moves from H, M or L and returns to one-second interval movement. Do not move the watch until the second hand returns to one-second interval movement.
B. Position of the Shorter End of the Second Hand during Reception (Shorter End of Second Hand)
[Reception Standby] [Reception in Progress] [Completion of Reception]
3. Recovery Automatic Reception When the watch has stopped as a result of being insufficiently charged, recharge the watch by sufficiently exposing it to light until the second hand moves at one second intervals. Radio waves are then received once automatically when the watch is sufficiently charged.
<Reception Procedure> Place the watch in a stable location where it is exposed to direct sunlight and where radio waves can be received easily such as by a window with the 9:00 position of the watch facing in the direction of the radio wave transmitter station. Reception of radio waves begins automatically once the watch has been sufficiently charged.
Note: Before using the watch, check the reception result. If radio waves have not been received properly, perform Free Reception to properly receive radio waves.

Reception level

Reception standby
The shorter end of the second hand moves the position corresponding to the reception level and reception begins. During the time radio waves are being received (while the shorter end of the second hand is indicating the reception level), the second hand and minute hand may move to correct the time. When reception is completed, each of the hands and the date are corrected automatically and the second hand resumes one-second interval movement.
The shorter end of the second hand moves to the RX position and begins preparation for receiving radio waves. The minute hand stops at the position corresponding to the second hand.
<Time Required for Receiving Radio Waves> It takes from about 2 to 13 minutes to receive radio waves. If reception has failed, it may take as much as about 50 seconds for the watch to return to the normal display.
C. Confirmation of Reception Result
When button (A) is pressed once following completion of reception, the shorter end of the second hand rapidly moves to H, M, L or NO enabling you to confirm the reception result. Note: Free reception begins if button (A) is pressed continuously for 2 seconds or more. The reception result is indicated for 10 seconds after which the watch automatically returns to the current time. In addition, the watch can also be returned to the current time by pressing button (A) while the reception result is indicated.
<Reception Result> When reception was successful: The time and date are corrected automatically based on the reception result, and the shorter end of the second hand begins one-second interval movement. When reception has failed: The watch returns to the time resulting from adding the amount of time required for reception to the time and date display prior to reception, and the second hand begins one-second interval movement.

Note: The shorter end of the second hand moves from the RX (Reception Standby) position to the Reception Level (H, M or L) position while reception is in progress. When reception is completed, the second hand returns to one-second interval movement. Do not move the watch until the second hand returns to onesecond interval movement.
D. Reception Level and Reception Result
During the standard time radio waves are being received, the shorter end of the second hand waits at the reception level position corresponding to the reception state to indicate the reception level. Following reception, the reception result can be confirmed by pressing button (A) once.
Reception Position of the shorter end of the level second hand H 42 seconds position Reception level during reception When radio wave reception level is high When radio wave reception level is moderate When radio wave reception level is low ----------
E. General Reference for Receiving Areas
The following provides a general reference for those areas where the watch is able to receive standard time radio waves. However, these areas may vary depending on the time, seasonal variations and weather (presence of lighting, etc.). Since this map only provides a general reference of the standard receiving areas, it may not apply in some particular locations even within the range shown on the map.
Standard time radio wave transmitter station DCF77 Location of transmitter station Mainflingen, Germany (25 km southeast of Frankfurt) General reference for areas where radio waves can be received Radius of about 900 km from radio wave transmitter station (radio waves may not be able to be received in the vicinity of Lake Leman)
Reception result after reception When radio waves were received at a high reception level When radio waves were received at a moderate reception level

39 seconds position

36 seconds position 25 seconds position
When radio waves were received at a low reception level When reception has failed
Although the standard time radio waves used by radio wave watches are transmitted continuously 24 hours a day, transmission may be interrupted for reasons such as maintenance and inspections. This watch will continue to keep the correct time at an accuracy of within 15 seconds per month even if it is unable to receive standard time radio waves.
4. Manually Setting the Time and Date
This watch allows the time and date to be set manually when radio waves are unable to be received.
Oslo Hamburg Hamb Berlin Paris Budapest Marseilles Rome Beograd Barcelona Naples
<Screw-Lock Type Crown> If the crown of your watch is of the screw-look type, operate the crown after first loosening the screw locking mechanism by turning the crown to the left. When finished operating the crown, turn the crown to the right while pushing in after having returned it to the normal position and tighten securely. After having manually corrected the time and date or after having corrected the time difference, make sure to securely tighten the screw locking mechanism of the crown after returning it to the normal position. Since the watch will continue to be in the hour hand and date correction mode or time difference correction mode, etc. if the screw locking crown is tightened immediately after completion of hand movement, the hour hand will advance causing the set time and so forth to be incorrect.

B. Correcting the Month and Year (No. of Years Since Leap Year)
<Reading the Month and Year> Decemb er The month and year (number of elapsed years from most recent leap year) are indicated with the second hand. The second hand indicates January when it points to the area between 1:00 and 2:00, February when it points to the area between 2:00 and 3:00, March when it points to the area between 3:00 and 4:00 and so forth until it points to area between 12:00 and 1:00 to indicate December. In addition, the first graduation of each month zone indicates a leap year, while the second graduation indicates the second year The illustration shows the after that leap year. example of April in the
3rd year after the most recent leap year.
Leap year 1st year 2nd y 3rd y ear ear Le 1s ap ye a 2n t ye d ar r ye ar
r yea eap ear L ty 1s year 2nd ar 3rd ye

Feb ruar y

L 1 eap 2n st ye year a d ye r ar
V Reading the Month January: The January zone is between 1:00 and 2:00 February: The February zone is between 2:00 and 3:00 : December: The December zone is between 12:00 and 1:00 V Reading the Year Leap year: 1st graduation of each month zone indicates a leap year 1st year after leap year: 2nd graduation of each month zone indicates the second year after a leap year 2nd year after leap year: 3rd graduation of each month zone indicates the third year after a leap year 3rd year after leap year: 4th graduation of each month zone indicates the fourth year after a leap year
<Quick Reference Chart for Number of Years Since Leap Year>
Year Elapsed year Leap year 1st year 2nd year 3rd year Year Elapsed year Leap year 1st year 2nd year 3rd year Year Elapsed year Leap year 1st year 2nd year 3rd year
<Correction Procedure> (1) Pull the crown out to the first position. The watch changes to the date correction mode, and the second hand moves to the position of the year and month stored in memory and stops. (2) Turn the crown to set the month and year. Turn the crown (one click) to the right to align the second hand at the position corresponding to the month and year. When the crown is turned (one click) to the left, the second moves backwards. Turning the crown continuously (by two clicks or more) causes the second hand to move continuously. Turn the crown to the left or right to interrupt continuous movement of the second hand.
Examples: In the case of December in a leap year: Align the second hand at the 0 seconds position. (The area between 12:00 and 1:00 is the December zone. The first graduation of a month zone is a leap year.) In the case of April in the third year after the most recent leap year: Align the second hand at the 23 seconds position. (The area between 4:00 and 5:00 is the April zone. The fourth graduation of a month zone is the third year after the most recent leap year.) Note: If the second hand is attempted to be corrected by turning by two or more revolutions from month and year when the crown is pulled out to the first position, the second hand stops when it has made two revolutions, and automatically returns to previous indication of the month and year. (3) After correcting the month and year, return the crown to the normal position. The second hand returns to the current time and begins to move.

<Times when Calendar Changes During Normal Use> Month and year: Changes at 12:00:00 AM on the first day of the month Date: Changes between around 10:00 PM and 3:00 AM
5. Time Difference Correction Function
This watch is equipped with a time difference correction function that lets you set a time difference in one hour units with respect to the received German standard time. When radio waves are received after having set a time difference, the time is displayed after correcting the set time difference. A time difference display monitor is provided that indicates whether or not a time difference is set with the shorter end of the second hand.
<Time Difference Setting Procedure> (1) Put the crown in the normal position. (2) Press button (B) once. The shorter end of the second hand moves to the SET or 0 position to indicate that the watch has entered the time difference correction mode. (3) Turn the crown to correct the time difference. A When the crown is turned (one click) to the right, the hour hand moves forward (clockwise) by one hour. B When the crown is turned (one click) to the left, the hour hand moves backward (counter-clockwise) by one hour.
Although the hour hand moves continuously when the crown is rotated continuously (by two clicks or more), move the hour hand one hour at a time to ensure that the time difference is corrected reliably. Turn the crown one click to the left or right to stop continuous movement of the hour hand. (4) Once the time difference has been set, the shorter end of the second hand moves to the SET position. The shorter end of the second hand moves to the 0 position if a time difference has not been set. (5) Press button (B) once after setting the time difference. This completes the procedure for setting a time difference. The second hand returns to one-second interval movement. Notes: Correct the time difference while being careful not to mistake AM, PM or the date. Time difference can be corrected for 10 seconds after pressing button (B) or for 10 seconds after the hour hand has stopped moving after correcting the time difference. The watch automatically returns to the normal display if the crown has not been operated for 10 seconds after pressing button (B) or 10 seconds after correcting the time difference.

[Normal Display]

[Time Difference Correction Mode]

(3) Either press button (B) again or simply wait for 10 seconds, after which time the watch automatically returns to the normal display. The time difference setting is now canceled and the second hand returns to onesecond interval movement.
[Time difference is set] Press button (B) once [Time Difference Correction Mode] [Time Difference Canceled] Press button (B) once
6. Solar-Powered Watch Handring Notes
This watch uses a secondary battery (rechargeable battery) to store electrical energy. Once fully charged, this watch will continue to keep the correct time for about 6 months during normal use (when the Power Save function is not activated). Furthermore, the watch will keep the correct time for about 2 years when the Power Save function is activated.
<For Optimum Use of this Watch>
In order to use this watch comfortably, try to keep the watch charged at all times. Charge the watch by exposing the watch dial (containing the solar cell) to direct sunlight or light from a fluorescent lamp. The watch will not be damaged no matter how much it is charged. Expose the watch dial (containing the solar cell) toward the light when charging.
<Try to Keep the Watch Charged at all Times>
The Shorter end of the second hand moves to SET Turn the crown to move the hour hand until the shorter end of the second hand points to 0 Second hand returns to onesecond interval movement
If you wear long sleeves, the fabric may cover the watch and prevent it from being exposed to light resulting in the watch becoming insufficiently charged. During the winter months in particular, it is recommended to charge the watch by exposing the dial to direct sunlight about once a month. When the watch is removed, try to place it in as bright a location as possible such as near a window so that sunlight shines onto the watch dial. This will keep the watch charged continuously and enable it to continue to run properly at all times.
7. Unique Functions of Solar-Powered Watches
When the watch becomes insufficiently charged, the display changes as shown below.
When the watch becomes insufficiently charged due to not exposing the dial (solar cell) to light
[Insufficient Charge Warning Display]
[Recovery Automatic Reception]
When sufficiently charged by exposing the dial (solar cell) to light *1
When reception is successful *2
Watch stops due to being insufficiently charged
If insufficiently charged state continues for 6 days or more

Depress button (B) for 10 seconds or more
<Reference Position of Each Hand and Date> Second hand, minute hand, hour hand: 12:00 position (0:00:00) Indicates a position Date: Between 31 and 1 between 31 and 1 Set the reference position if any of the hands or date do not indicate the reference position.
A. Checking the Reference Position
(1) Press button (B) for at least 10 seconds with the crown in the normal position, and once the second hand begins to move rapidly, release button (B). The hour hand moves to the reference position after the second hand and minute hand have moved to the reference position. The hour hand continues to advance until the date is displayed between 31 and 1. Since the date changes in coordination with the hour hand, it displays a position between the 31 and 1 and stops. (2) When button (B) is pressed after reference position is indicated, the hands rapidly return to the current time. Alternatively, the watch will automatically return to the current time if the buttons or crown are not operated for 30 seconds or more.
B. Setting the Reference Position
(1) Press button (B) for at least 10 seconds with the crown in the normal position, and when the second hand begins to move rapidly, release button (B). The hour hand moves to the reference position after the second hand and minute hand have moved to the reference position. (2) Pull out the crown to the first position and turn the crown to set the date between 31 and 1 and set the hour hand to 12:00.
Turning the crown continuously (by two clicks or more) causes the hour hand to move continuously. When the hour hand makes two revolutions, the date changes by one day. Continuously advance the hour hand until the date is displayed between 31 and 1. Turn the crown to the left or right to interrupt continuous movement of the hour hand. After the date displays between 31 and 1, slowly turn the crown until the hour hand indicates 12:00. (3) Pull out the crown to the second position and turn the crown to set the second hand and minute hand to 00 minutes 00 seconds. Turning the crown (by one click) causes the second hand to advance by one second, and the minute hand to advance in coordination with the second hand. Turn the crown to the right or left to set the second hand and minute hand at 00 minutes 00 seconds. Turning the crown continuously (by two clicks or more) causes the second hand and minute hand to move continuously. Turn the crown to the left or right to interrupt continuous movement of the second hand and minute hand. (4) Return the crown to the normal position and press button (B). Each hand and the date rapidly return to the current time. * This completes setting of the reference position. After setting the reference position, always make sure to perform free reception before using the watch.

<Changing the Mode when Setting the Reference Position>
[Normal Operation] Button (B)
Press button Press button (B) (B) or returns for 10 seconds or automatically more after 30 second [Reference Position Correction Mode] [Reference Position (correction of hour hand and date) Confirmation Mode] Crown to first position Crown to second position
[Reference Position Correction Mode] (correction of second and minute hands)

Crown to normal position

Crown to first position

11. All-Reset

The watch display may become abnormal due to the effects of static electricity or a strong shock. If this happens, perform the all-reset procedure and then set the reference position.

Button (B)

B. Setting the Reference Position after All-Reset
(1) Align the second hand and minute hand at 00 minutes 00 seconds. Turning the crown (by one click) causes the second hand to advance by one second, and the minute hand to advance in coordination with the second hand. Turn the crown to the right or left to set the second hand and minute hand at 00 minutes 00 seconds. Turning the crown continuously (by two clicks or more) causes the second hand and minute hand to move continuously. Turn the crown to the left or right to interrupt continuous movement of the second hand and minute hand. (2) Push in the crown from the second position to the first position, set the date between 31 and 1 and set the hour hand to 12:00. Turning the crown continuously (by two clicks or more) causes the hour hand to move continuously. When the hour hand makes two revolutions, the date changes by one day. Continuously advance the hour hand until the date is displayed between 31 and 1. Turn the crown to the left or right to interrupt continuous movement of the hour hand. After displaying the date between 31 and 1, slowly turn the crown until the hour hand indicates 12:00.

A. All-Reset Procedure

(1) Pull out the crown to the second position. The second hand rapidly moves to the reference position stored in memory and stops. (2) Press buttons (A) and (B) simultaneously.
This completes the all-reset procedure. Always make sure to set the reference position according to B. Setting the Reference Position after All-Reset after performing the all-reset procedure. Note: Do not push in the crown to the normal position until the reference position has been set after performing the all-reset procedure.
Note: If the crown is accidentally pushed in too far to the normal position when the crown is pushed in from the second position to the first position, since this will end setting of the reference position causing the hands to move normally, it will not be possible to set the reference position for the hour hand and date. If the crown has returned to the normal position, set the reference position by referring to 10. B. Setting the Reference Position. Alternatively, repeat the all-reset procedure again. (3) Return the crown to the normal position. When the reference position is set after performing the all-reset procedure, the second hand begins one-second interval movement a few seconds after the crown is returned to the normal position. Do not pull out the crown until the second hand begins one-second interval movement. (4) Perform free reception or set the time and date manually.

Crown for turning the outer scale Inside scale Outside scale

A. Navigation Calculator

1. Calculation of time required Question: How long does it take an airplane flying at 180 knots to fly a distance of 450 nautical miles? Solution: Set the 18 mark on the outside scale to the SPEED INDEX (Y). At this time, the point on the inside scale that is aligned with 45 on the outside scale indicates (2:30), and the answer is 2 hours and 30 minutes.
2. Speed (Ground Speed) Calculation Question: What is the speed (ground speed) of an airplane when it takes 1 hour and 20 minutes to fly a distance of 240 nautical miles? Solution: Align the 24 on the outside scale with 1:20 (80) on the inside scale. At this time, 18 is aligned with the SPEED INDEX (Y) on the inside scale, and the answer is 180 Kt.
3. Flying distance calculation Question: What is the flying distance traveled in 40 minutes at a speed of 210 knots? Solution: Align the 21 on the outside scale with the SPEED INDEX (Y) of the inside scale. The 40 of the inside scale is now pointing to 14, and the answer is 140 nautical miles.
4. Fuel consumption rate calculation Question: If 120 gallons of fuel are consumed in 30 minutes flying time, what is the fuel consumption rate? Solution: Align the 12 of the outside scale with 30 of the inside scale. The SPEED INDEX (Y) now points to 24, and the answer is 240 gallons per hour.
5. Fuel consumption calculation Question: How much fuel is consumedin 6 hours at a fuel consumption rate of 250 gallons per hour? Solution: Align the 25 of the outside scale with the inside scales SPEED INDEX (Y) of the inside scale. The 6:00 is aligned with 15, and the answer is 1500 gallons.
6. Maximum flying hours Question: With a fuel consumption rate of 220 gallons per hour and a fuel supply of 550 gallons, what is the maximum number of flying hours? Solution: Align the 22 of the outside scale with the inside scales SPEED INDEX (Y) of the inside scale. The 55 of the outside scale is now aligned with 2:30, and the answer is 2 hours and 30 minutes.
7. Conversion Question: How do you convert 30 miles into nautical miles and kilometers? Answer: Align the 30 on the outside scale with the STAT (Y) mark on the inside scale. At this time, 26 nautical miles is aligned at the NAUT (Y) mark on the inside scale, while the answer of 48.2 kilometers is aligned at the kilometers on the inside scale.
B. General calculation functions
1. Multiplication Question: 20 M Solution: Align 20 on the outside scale with X on the inside scale, and read the outside scale at the 30 mark which is aligned with 15 of the inside scale. Figure the number of decimal places, and the answer is 300. Remember: decimal places cannot be read on this scale.
2. Division Question: 250/20 Solution: Align 25 on the outside scale with 20 on the inside scale. On the outside scale 10 read the 12.5 mark that is aligned with X on the inside scale. figure the number of decimal places, and the answer is 12.5.

3. Reading Ratios Question: 30/20 = 60/x Solution: Align 30 on the outside scale with 20 on the inside scale. At this time, the answer of 40 can be read from the inside scale corresponding to 60 on the outside scale. In addition, the ratio of the value on the outside scale to the value on the inside scale is 30:20 at all positions on the scales.
4. Determining Square Root Question: What is the square root of 225? Solution: Rotate the scales so that the value on the inside scale corresponding to 22.5 on the outside scale is equal to the value on the outside scale corresponding 10 to X on the inside scale, and read off the answer of 15 at that location.

14. Precautions

CAUTION: Water-resistance performance There are several types of water-resistant watches as shown in the following table. The unit "bar" is roughly equal to 1 atmosphere. * WATER RESIST (ANT) xx bar may also be indicated as W.R. xx bar.
Indication Dial WATER RESIST or no indication WR 50 or WATER RESIST 50
WR 100/200 or WATER RESIST 100/200
For correct use within the design limits of the watch, confirm the level of waterresistance of your watch, as indicated on the dial and case, and consult the table.

Examples of use

Case (Case back) WATER RESIST(ANT)
WATER RESIST(ANT) 5 bar or WATER RESIST(ANT) WATER RESIST(ANT) 10 bar/20 bar or WATER RESIST(ANT)
Specifications Water-resistant to 3 atmospheres Water-resistant to 5 atmospheres Water-resistant to 10/20 atmospheres
Minor exposure to water (washing face, rain, etc.)
Moderate exposure to Marine sports (skin water (washing, kitchen diving) work, swimming, etc.)
Scuba diving (with air tank)
Operation of the crown or button with moisture visible

OK OK OK

NO OK OK

NO NO OK

NO NO NO
Water-resistance for daily use (to 3 atmospheres): This type of watch is water-resistant to minor exposure to water. For example, you may wear the watch while washing your face; however, it is not designed for use underwater. Upgraded water-resistance for daily use (to 5 atmospheres): This type of watch is waterresistant to moderate exposure to water. You may wear the watch while swimming; however, it is not designed for use while skin diving. Upgraded water-resistance for daily use (to 10/20 atmospheres): This type of watch may be used for skin diving; however, it is not designed for scuba or saturated diving using helium gas.
If seawater enters the watch, place the watch in a box or plastic bag and immediately take it in for repair. Otherwise, pressure inside the watch will increase, and parts (crystal, crown, buttons, etc.) may come off.

CAUTION:

 

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