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ii. Output Period
：
This is to set NMEA output selection for the Bluetooth interface in the
NAV mode.
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Check the NMEA type -> Choose output period -> Set
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For selecting NMEA data output (RMC, GSV, GSA, GGA are
compulsory data, user are not allowed to DE-SELECT)
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NMEA setting here will only affect the NMEA sentences for
navigation usage. This has nothing to do with logger’s data recording.
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Period (s): For example, GLL (4) stands for GLL sentence update
every 4 seconds.
