Founded in 1973, Carn is dedicated to highlighting and furthering the aims of the Celtic League, including language preservation and self-determination for the Six Celtic Nations.
The articles are published in English, with articles also in the six Celtic languages: Breton, Cornish, Irish, Manx, Scottish Gaelic, and Welsh, with translations and summaries in English. In the past, articles have also appeared in French.
The cover of the magazine for a number of years has been a map showing the various Celtic countries, notated with their names in their respective native languages.
Nationality is indicated by letters after their names as so: