Amazon is now saving location of user address on maps and providing these to delivery executives to get to the address easily. From past 2-3 weeks I am receiving my orders directly delivered without any calls enquiring the location
On amazon mobile app, you can see link below saved addresses to view the location on map
They are using Nokia maps and looks like they are capturing the address during delivery and are using it during next delivery to locate address easily.
I have around 10 addresses saved on my account and all of them have location saved corrercly. Looks like they started saving location from past few months and have started using them recently.