Every week day morning from 6:00 to 7:0 am (EST) on the History Channel they have the History Channel Classroom. This is where they show their programs without commercials for the schools to use. Over the years I hae recorded many of their programs for two of the schools that I have worked at. A&E and Biography channels also have the same style of programs for the schools.
I noticed that this Friday's program is the Viking Ships from the Great Ships series. Hopefully the schedule is correct and it will be on. Give it a look.
Jim