large-scale map; detailed map
Refers to a map that shows fine detail, often at a large scale, as opposed to a broad overview map (広域地図).
See also: 広域地図
You need a detailed map for hiking.
This large-scale map even shows small alleys.
広域地図 is a broad overview map covering a wide area, while 詳細地図 is a detailed, large-scale map focusing on a smaller area.
Compound of 詳細 (detailed) + 地図 (map).