Fallout 4 map system problem ?

hi i try to make the fallout 4 map system

Needed :
Image With button on certain location that transfert the player to new location
Also a drag and move around system : i can right click and move around the map to check the location
It’s not a World map : no camera above the player, we need to use a image

For my specific project :
i will make 2 side menu with information on tha clicked location, and another button to accept the sector

Current Issu
i don’t know how to make a widget that go above the size of my screen AND where i can move around
I got issu on how to anchor my location button freely, ussually it stick on side ETC …