Oceanic ATOM 2.0 ユーザーズマニュアル

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  Depressing and holding the S button while the Set Point is
flashing will scroll through the Set Points in increments of 1
Hour at a rate of 4 per second.
  Pressing and releasing the A button momentarily (< 2
seconds) will save the Set Point and/or advance to the
ALTERNATE TIME screen.
  Depressing and holding the M button for 2 seconds will
revert to the MAIN TIME screen.
If no button is pressed during a period of 2 minutes, the unit will
revert to the MAIN TIME screen.
WATCH COUNTDOWN TIMER (HR:MIN)
Pressing the M button momentarily 2 times (< 2 seconds each)
while the Local Default Time screen is displayed will access the
Countdown TIMER screen, displaying the remaining Countdown
Time (hr:min) if running, or OFF flashing (Fig. 18) and the
previously set Countdown Time (hr:min) if the set Countdown
started and has ended, or OFF (solid) and 0:00 if no time was
previously set.
Once set ON, a Countdown will run in the background until it
counts down to 0:00, or it is set OFF, or a Dive is made at
which time it will default to OFF and the value previously set.
FREE Dive Mode has a separate Min:Sec Countdown Timer.
Fig. 18 - WATCH COUNT-
DOWN TIMER