To establish a plan, method, or course for something. After Rose's surgery, the doctor will chart out a treatment plan for her ongoing physical therapy. Mom and dad are still charting out a course for our road trip.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
chart something out (for someone or something)
to lay out a plan or course for someone or something. The navigator charted the course out for the captain. The captain charted out the course for us.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.