It's likely that APRS# has been a console app before now. For this milestone to be complete, APRS# should be an app with a beautiful UI for viewing and creating APRS messages. Likely specialized screens for weather display or map view. Preferably this should be sharing code to run across mobile devices and computers. Consider Xamarin https://dotnet.microsoft.com/apps/xamarin, .NET MAUI https://devblogs.microsoft.com/dotnet/introducing-net-multi-platform-app-ui/, or another similar platform.