The Ascendant and Descendant Course Blocks by Valery Fremaux help to highlight the relationships between meta course links automatically and provide links to both the Master course or a Meta course (think child to meta course relationship where the master is where the student is enrolled but inherits enrollment in the meta course). Meta course links are a standard enrollment plugin for Moodle, these blocks just make the management of them, and subsequently the navigation that much easier to highlight for students.
More information is available at mylearningfactory.com.
Check out both at Moodle.org:
- Ascendant Block: https://moodle.org/plugins/view.php?plugin=block_course_ascendants
- Descendant Block: https://moodle.org/plugins/view.php?plugin=block_course_descendants