GMap.NET.Point pt = mapControl.FromLatLngToLocal(pll);
where pll is a point on the map and mapControl is a GMapControl
I get it; these are virtual screen coordinates; my zoom level is currently not showing the whole map so some of my points are off the screen resulting in large numbers.
On another topic, does mapControl.ZoomAndCenterMarkers(null) work? It seems to Zoom okay, but seems to center on the last added marker.