The dungeon overview map is the visual representation of all the dungeon floors that make up the dungeon in its entirety.
From this map the player can see their progress through it.
The map can be accessed by:
Leaving the town and using the map to select what dungeon floor you want to go to.
Exiting a dungeon floor via a floor exit.
The dungeon map is used to:
Select and enter a Dungeon Floor.
Exit the dungeon to return to the town.
Viewing the stats of a dungeon floor such as:
The number of prisoners left to rescue on it.
The type of items and resources that can be found there.
The type of enemies that can be encountered there.