They're swift off the mark at McBooks Press
Every month, they put out a newsletter called "Quarterdeck," featuring maritime fiction and nonfiction that is not necessarily published by them. The able editor, George Jepson, keeps a comprehensive eye on the genre, and is always interested in new voices.
No sooner has the new year dawned, than the January issue has magically materialized. It's well worth a read, particularly a most engaging interview with Bernard Cornwell.
You can download the newsletter and subscribe (if you wish) HERE.