believe me; you are one of the few - especially in Europe - who have no idea about it.
However, an app is used a lot (Campercontact, ACSI) and the point is shared with iGO / Sygic.

And since many copy from each other, a POI is equally accurate or equally imprecise for almost everyone.

As the "inventor" of camping-cars-guide.net, I know what I'm writing about