Of course DR requires a known reference point. If you weren't so convinced
navigation is impossible without a GPS you might learn how it works.

jeffies, virtually every last pilot in the country with a valid license is
laughing at you. "flying blind" is illegal, and has been for seven some
decades, and for good reason. All pilots know that and know why.

you have changed the definition of DR to that of "pilotage", as in going from
one known landmark to the next.