User manual CITIZEN WATCH C900

[. . . ] English CAUTION · Before using the watch, read this instruction manual carefully for safe and correct use. · After reading this manual, keep it handy for future reference. WARNING Diving is inherently dangerous. When wearing this watch while diving, please make sure that you have a correct understanding of the handling of it as described in these instructions and observe the correct operating procedure at all times. The water depth gauge of this watch is not certified for use as an officially sanctioned measuring instrument. [. . . ] · When desiring to have the dive time alarm not sound at all, set the dive time to "----". (8) Press button (M) to return the watch to the normal display. * If none of the buttons are pressed for about 3 minutes when the display is flashing, the watch automatically returns to the normal display. * Pressing button (M) when the display is flashing immediately returns the watch to the normal display. * If none of the buttons are pressed for about 3 minutes when the watch is in the dive alarm mode, it automatically returns to the time/calendar mode. <Dive Alarm Monitor> Each of the alarm tones of the depth alarm, dive time alarm and rapid ascent warning alarm can be monitored for about 4 seconds each in that order by pressing button (A) in the dive alarm mode. Each alarm tone can be heard in sequence for as long as button (A) is pressed. 44 45 12. Using the Altitude Memo Mode In this mode, point memos (point number, memo date, memo time, altitude, barometric pressure, temperature and altitude and temperature differences as compared with the previous point) can be recalled and displayed for a maximum of six locations previously stored in memory during altitude measurement. Point no. (3) The display changes in the order shown below each time button (A) is pressed. The contents of one point memo are displayed using four separate displays. Altitude/barometric pressure Point no. A. Recalling a Point Memo (A) (A) Memo time Memo date (A) Temperature (A) Altitude difference Temperature difference (B) (1) Press button (M) to switch to the altitude memo mode. (2) The point number changes in order starting with the oldest point memo each time button (B) is pressed (B) (B) (B) (B) (B) Memo date or switches automatically after 2 seconds (A) (M) A. log (B) Memo date A maximum of six points can be stored in memory as point memos. When more point memos are necessary, save the new memo in the altitude measurement mode after first deleting all point memos in memory. 46 47 * Altitude and barometric pressure are alternately displayed. Altitude is displayed in "m", while barometric pressure is displayed in "hPa". * When displaying altitude and temperature differences, a comparison is made with the values of the previous point number. A " " is displayed if the altitude or temperature has risen, and a " " is displayed if the altitude or temperature has fallen. A series of hyphens (----) is displayed for the altitude and temperature differences of point no. 1 since there is no previous data for comparison. * A series of hyphens "----" is displayed when there are no point memos stored in memory. * When there are less than six point memos in memory, only the point memos stored in memory are repeatedly displayed whenever button (B) is pressed. * If none of the buttons are pressed for about 3 minutes in the altitude memo mode, the watch automatically returns to the time/calendar mode. 13. Using the Water Depth Measurement Mode When the water sensor gets wet in any of the standard modes (except during chronograph measurement), the watch automatically switches to the water depth measurement mode (preliminary dive display). When water depth exceeds 1 meter during the preliminary dive display, water depth measurement begins, and water depth is measured once every second. <Preliminary Dive Display> Mark flashes Current depth <Water Depth and Time Measurement Display> <After Dive 0m Display> 0. 0 m flashes When water depth becomes less than 1 meter B. Deleting a Point Memo All point memos are deleted by simultaneously pressing buttons (A) and (B) for at least 2 seconds. A tone confirming deletion of point memos sounds at this time. [. . . ] If the watch comes in contact with mercury used in thermometers, the case, band or other parts may become discolored. 23. All-Reset The all-reset procedure is used to return all functions of the watch, including the time and calendar, to their initial states. Perform this all-reset procedure when the display of the watch is abnormal and after replacing the battery. (1) Loosen the crown screw and pull the crown out. [. . . ]