JMA-9100/7100 Installation Manual > 4.INITIAL SETTING > 4.11 DATE/TIME DISPLAY SETTING
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6.Synchronize with GPS
Even if this item is set at On, if the ZDA sentence is not inputted, date and time
are displayed by using the clock function provided in the apparatus.
By using the ZDA sentence sent from GPS, date
and time synchronized with GPS are displayed.
On: Time is synchronized with GPS.
Off: Time is not synchronized with GPS.