You can never know too much or enough, knowledge is something we all need to be prepared for any situation. When it comes to traveling, it is the same.
Google Maps won’t help you build your route when traveling in South Korea. The government of this country won’t give rights to Google for using their cartographic data because of national security considerations. That’s why before starting a journey in South Korea, you should install a local navigation app. The most popular one is NAVER Map and it’s available in both Korean and English.