What Are the Blue “Radiating Lines” In the iOS Maps App?

I notice that in iOS (14.3) my iPhone and iPad designate my current location in the MAPS APP with a blue dot. What I am curious about are the blue lines that radiate out from this dot. The “radiating” lines are pie-shaped and only emanate from about a sixth to an eighth of the blue dot’s circumference. As I rotate the phone or iPad the lines don’t continuously point in one direction as though they are “magnetically” linked to some cell tower or external point. They move instead. Anyone to enlighten me?
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ROD REED