A free mod for Witcher 3, by Kexikus.

There are the places where you can go to find out more information about the world. For example, you can find out the location of the secret chests, or you can find out the location of the player-controlled area, or you can find out the location of the mountain, etc. If you want to make sure that you don’t miss any of these places, you can use the Map Marker Outlines mod.

Installation:

Download the zip file and extract modMapMarkerOutlines to your directory.

Uninstallation:

Remove modMapMarkerOutlines from your directory.