Unreal Engine plugin: UINavigation
UI Navigation system helps to simply creates navigation widgets like map, minimap, comapss and any other you need.
Also this plugin inclused easy to use marker system for any objects in the game.
It is fully C++ so it works fast and easy to modify, if you don`t need C++ you also can use it in making blueprints inhereting from C++ classes, that includes all needed staff, to make it easy to use.