MicroMap is a straightforward module to add a customizable minimap to your Foundry setup.
Display a static image or a Foundry scene, including one other than the currently active scene
(Displaying a scene does come with some limitations, currently.)
Add a fancy border to the map, make it shaped like something other than a boring ol' rectangle, show your players just where they are in your giant sprawling epic megadungeon or whatever purpose you can find for having an image or scene view on the screen your creative mind can muster.
More specifics about customization and usage can be found on the Wiki
