11-month résumé gap, advice?, production planner here

I have been out of work for 11 months and worry about the gap. I worked as a production planner before this. I have done some volunteering and a course during that time. What do you say in interviews?

I listed the volunteering and course under the same dates and kept the explanation to a sentence in the cover letter.

Keep everything in writing and save the confirmation numbers. It made the follow-up calls so much easier.