If you can't plan a new route in Korea from iGPSPORT APP,
Firstly, you may plan a new route from the following website:
Secondly,you may follow the steps to import the routes into iGS620.
Steps to import the routes into your iGS620.
1) Power off the device, connect it to computer;
2) Short press left button,the device will be recognized as a new disk;
3) Import the route file under the folder named "navigation".