Is there a maui map control. If so is there a tutorial somewhere. I do not wish to use a 3rd party control, and I want to use opensteetmap. I realy do not want to use google maps.
The official Maps functionality was unfortunately cut for the current GA version. It is on the roadmap for .NET 7 which is scheduled for November.
However, that functionality will use the map which is supported on each platform, so: Apple Maps for iOS/macOS, Google Maps for Android and Bing Maps for Windows. And you specified you wanted to do OpenStreetMap.
For this there is a third-party control: MapsUI. They are working on .NET MAUI support and I think they already have a test version that has .NET MAUI support.
Update November 2022: See the new Microsoft.Maui.Controls.Maps package, released for .NET 7.