Nikon 1 aw1 Reference Manual page 137

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Logs
Logs can only be created if the camera clock is set. When tracking is
active, the camera continues to monitor its position or depth even
when off; tracking only ends when the specified log length is reached,
the battery is exhausted or removed, End log > Erase log is selected
for Create log in the setup menu, or No is selected for Location data >
Record location data in the setup menu (note that no data will be
added to location data logs while the camera is unable to receive loca-
tion data). To prevent logs ending prematurely, be sure the camera bat-
tery is fully charged before starting.
Data logged while tracking is active are temporarily recorded to cam-
era memory; new logs can not be created until the current log has been
saved to the memory card or erased. After recording a log, be sure to
save it to the memory card.
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Copying Logs to a Computer
Logs are stored in the NCFL folder on the memory card and have names
consisting of "N" followed by the log date (expressed as a six-digit num-
ber in the form yymmdd), a single-character identifier from 0 to Z
assigned in ascending order by the camera, and the extension ".log"
(location data logs) or ".lgb" (depth logs); thus the first location data log
recorded on October 15 2013 will be named "N1310150.log". To copy
the files to a computer, insert the memory card in a card reader or card
slot and transfer the files using Nikon Transfer 2. Note that although the
log files produced by the camera conform to the NMEA standard, they
may not display correctly in some applications or on some devices.
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See Also
Logs can be deleted from the memory card using the Delete log
option in the setup menu (0 113).
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