That is an interesting idea jarbear. It makes the dagger less of a way finder for the Wayfinder, and more of an independent tool. Though it might raise questions of why he didn’t use it to find Rey before leaving Jakku.
EDIT: Maybe she could hear whispers of “Endor” and “Death Star” rather than literally seeing it. And Rey didn’t know how to use it when she first picked it up, but I can see the fear of that not being explicit.