Steps to download map for iGS620 or iGS618: 

1. Enter webpage: http://global.igpsport.com/home/download

2. Choose and download the map of your country.

3. Power off the device, connect the device to a computer.

4. Short press left button,the device will be recognized as a new disk.

5. Import the map into your device under "navigation"file.

Guide video : https://www.youtube.com/watch?v=eUMVXitj8YU