If you don't have an internet connection in the field, you'll need to download a background map prior to leaving for the field.
On the Settings tab, select “Offline Maps” and “New offline map”.
Navigate to the desired location, either manually or by using the search function on the bottom left. Choose the right map type, zoom options (defaults of 14-18 should normally be fine), give the set a descriptive name. If you want to download elevation data for the selected area, you can check the box "Include elevation data" located below the selected map type. By clicking on download, you start the downloading of the map tiles and, if selected, the elevation data.
Be patient if the tiles are not loading immediately. If it does not progress for several minutes, restart WingtraPilot, navigate to the "Settings" tab, select "Offline Maps" again, and click onto your new set. On the right side, click on "resume download" and be patient again. Once the download has completed, the dot on the right side in the box will change from red to green. If elevation data has also been downloaded, it will appear in a separate box.