Features

How to use


F990

Particular settings for satellite controlled watches

Checking and adjusting the leap second setting manually

  1. Pull the crown out to position 1.
  2. The second hand points to 30 seconds and stops.

  3. Rotate the crown to set [SET] on the mode indication to the ◀ marker.
  4. !

    Set the mode name you want horizontal.

  5. Pull the crown out to position 2.
  6. The second hand stops.

  7. Press and hold upper right button B for 2 seconds or more.
  8. Using the “0:00:00” position as the starting point, the minute and second hands indicate the leap second setting.

    When the leap second setting is “‒37 seconds”, the hand points to “0 minute 37 seconds”.


    When the leap second setting is "‒65 seconds", the hand points to “1 minute 5 seconds”.

  9. Turn the crown to adjust the setting if the leap second is not correct.
  10. !

    Adjustable range is from 0 to ‒90 seconds.

  11. Push the crown in to position 0.
  12. Pull the crown out to position 1.
  13. Rotate the crown to set [TME] on the mode indication to the ◀ marker.
  14. !

    Set the mode name you want horizontal.

  15. Push the crown in to position 0 to finish the procedure.
  16. The second hand returns to indicate the second.

Related articles

Information on leap second setting

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Information on rollover number setting