Search messages
Without an account, search covers the last 3 days, by text only.
A free account adds the filters (warning number, dates, station, NAVAREA and subject) and searches the last 12 months. The full archive is part of Pro.
In force only
Hides warnings cancelled by a later broadcast or no longer on the official list.
Unreadable fragments
Copies whose opening line, which names the station and message number, could not be read, so they can't be tied to a station or message. They are hidden unless you tick the box.