PARTICULARLY SENSITIVE SEA AREA (PSSA) AND WETREP
Tankers of more than 600 dwt carrying heavy crude oil,
heavy fuel oil or bitumen and tar and their emulsions are
required to participate in the mandatory ship reporting
system Western European Tanker Reporting System (WETREP).
See the publication UKHO NP286(1) ALRS Volume 6 Part 1 for
further details.