Fonstad uses colored or dashed lines to track the movements of the Fellowship, Bilbo’s company, and even Beren and Lúthien.
Make sure you have the (published in 1991 or later). Fonstad updated her original work after the publication of The History of Middle-earth series, which provided much more detail on the Elder Days and the layout of Beleriand. 2. How the Book is Structured The Atlas of Middle-Earth
Tolkien didn't map everything. Fonstad clearly notes in the text where she had to use "geographic logic" to fill in gaps that Tolkien left vague. 5. Why It’s Unique Fonstad uses colored or dashed lines to track