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In the Field 5
The Asset Surveyor software aligns the internal clock of the
datalogger to UTC (Universal Time Coordinated) time, which is based
on GMT (Greenwich Mean Time), while you are connected to a GPS
receiver, so it can display the current time to the precise second,
anywhere on earth. When not connected to GPS, the TSC1
datalogger’s clock drifts somewhat, but is still reasonably accurate.
Whenever you next connect to a GPS receiver, the Asset Surveyor
software immediately realigns the TSC1’s clock to UTC time.
To view the local time to GPS accuracy, select the Time and date entry
from the Configuration menu. The Time and date configuration form
appears:
Until you have connected to a GPS receiver and obtained an accurate
time, the Asset Surveyor software simply uses the internal clock of the
TSC1 datalogger. Initially, the Asset Surveyor software does not know
the time zone of the area in which you are operating. When you set the
time and date to within 7½ minutes of the actual local time (some time
zones are only 15 minutes ‘wide’), the Asset Surveyor software
automatically aligns it precisely using GPS time (and the known offset
to UTC time). From this point on, the Asset Surveyor software,
together with your GPS receiver, can serve as the most precise
timepiece you are ever likely to own.
TSC1 Asset Surveyor Operation Manual 71