There is a collection of over 40 real-time datasets that are provided by NOAA.
Because these datasets tend to be quite large and internet speeds vary from
site to site, the SOS software can be modified to adjust the number of
real-time datasets downloaded.
Typically, sites are set to download real-time data either every hour or every
three hours. The frequency of the downloads and the amount of real-time
datasets downloaded can be adjusted for each site. In
/shared/sos/media/playlists are various real-time dataset playlists that vary
from just a few datasets to all of the real-time datasets. You can also create
your own playlist of the real-time datasets that your site is interested in
using. A crontab is then used to keep all of the real-time datasets in your
playlist up to date.