Using the Watch in an Aircraft
Put the watch into the Airplane Mode whenever you are inside an aircraft or in any other area where radio wave reception is prohibited or restricted.
Entering the Airplane Mode disables GPS signal and time calibration signal reception.
Entering and Exiting the Airplane Mode
Hold down the watch's lower left 
button for at least four seconds to enter or exit the airplane Mode.
Even though the mode changes two seconds after you depress the button, keep the button depressed for at least four seconds.
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In the Airplane Mode
When the watch is in the Airplane Mode, the mode hand points to the airplane mark.
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Not in the Airplane Mode
When the watch is not in the Airplane Mode, the mode hand points to the current day of the week.