It might help as someone who believes they have aphantasia that the steps that I do in my head to list out the steps to go somewhere is identical to the steps I would list out to tell someone how to code something up. If you were to ask me for landmarks like stores that I would pass I would be able to do so, but I wouldn't be thinking of what they look like while listing them out just as I wouldn't be thinking of text while coding.

It's less instructions and more a full understanding of the structure at play.