When you first slap a GMap.NET control on your Windows form, there will always be a red cross in the middle of the map, clearly to indicate where the map center is should your application allow people to indicate something on the map. Sometimes, though, you’re really just showing a map and the red cross has to go.

The only catch here is that is cannot be done through the properties window of the control, but only in code:

mymap.ShowCenter = false;

And done.