The NetCDF Generation Service is a background service whose job is to take sensor data and dump it into a NCEI compliant NetCDF file.
This service has three primary ways of generating NetCDF files:
Methods 2 & 3 above pull data directly from the database and are not real-time.
If you disable the NetCDF service sensor data will still be recorded into the database (you will not lose data). However, until you get it running again submissions to NCEI will fail and at the end of the cruise you will not be able to pull your data from the database out into NetCDF files for distribution to the science parties. In this event you could fallback to using the RAW files.
See also: NetCDF