UAE - United arab emirates

UK - United Kingdom

UKAH - UK/Continent, Antwerp/Hamburg range

UKBH - UK/Continent, Bordeaux/Hamburg range

UKC - UK/Continent

UKHH - UK/Continent, Havre/Hamburg range

UNCTAD - United Nations Conference on Trade & Development
USAC - U.S.Atlantic Coast

USC - Unless sooner commenced

USG - United States Gulf (a U.S. port on the Gulf of Mexico)

USNH - United States North of (cape) Hatteras

UU - Unless used 

UUIWCTAUTC - Unless used in which case time actually used to count