From Wikipedia, the free encyclopedia.

The Blue Ensign is used either plain, or defaced with a badge or other emblem.
Plain blue ensign
The plain blue ensign is permitted to be flown, instead of the red ensign, by two categories of vessel:
Defaced blue ensign
Defaced with a badge or emblem, the blue ensign forms the flag of:
A law of 1864 allowed free use of the blue ensign in these two ways.
National flags based on the blue ensign
These include:
External links
Blue ensign page on the "Flags of the World" website

