Basicly you import a map as jpg. It is hidden in player view and you can reveal custom shapes to them. You can place pins on the map that can be linked to your content. Map zooming and panning is possible so even large maps with lots of details can be managed. I designed a region of my setting by taking a map, marked the points of interesst and fleshed out content, linked it together and went into further detail as I went along. It was fun doing it that way. Think of the Paizo Kingmaker map ( not the map, I don´t like that one ) but the marked plot hooks and landmarks.

@mearrin69 Any chance of getting your Lonewolf Forum name?