You can download and delete maps on DURA directly through the COROS app.
Open the app to the Profile Page, select your DURA, and choose "Map Manager". From here you are able to view what maps you have already installed and navigate to new areas to download a desired section. Press "Download" at the top of the page to download new maps, or "Delete" to remove map files from your watch.
The app will automatically parse the map segments into squares so that you can select the exact area(s) you wish to download or delete by toggling between the two separate pages at the top. Once you select an area to download/delete, the app will prompt you to connect your DURA to WiFi if you have not already. Once connected, DURA will automatically download the selected maps over WiFi.
Once your DURA has maps downloaded, you will see a default maps page appear any time you track an outdoor ride. Simply use the dial or touchscreen to scroll through your data pages until you see the map view.
You can also customize the map direction by going to System > More Settings > Map Direction and choose North Up or Heading Up.
To view your data fields and map on the same page, turn on Split Screen mode by going to the activity settings menu for your desired bike mode, then scrolling down to Split Screen.