Key features: 1. Offline maps from official sources. 2. Usable even no internet connection and Wi-Fi lost. 3. Can zoom in, zoom out and scroll vertical and horizontal. 4. Easy to use. Quick to find your place. 5. Without charges. 6. Bookmark and customize maps and web pages by yourself. 7. Local guide and local foods guide. 8.Paperless and environmental sustainability This app includes: 1. Seoul Metro Map 2. Seoul Tourist Map 3. Seoul Travel Guide Book 4. Seoul Itinerary 5. Seoul Gay Travel Guide