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So that means there is no way to reproject a base map into 3TM and view all of North America (coast to coast)? If the answer is no, is there a way I can work around this problem? My current issue is that if I draw something on the graphics layer in North America, it's actually visible in Western Europe.
I'm afraid I don't understand your statement about graphics layer items visible in Western Europe. They're not placed correctly? Or...?
For my map, I am using an ESRI basemap (WGS 1984) onto which I layer a NAD 83 layer (ie: roads) via a feature service. On top of these 2 data layers, I have a graphics layer. When I draw something (ie: highlight a road) on the graphics layer via C#, the (x1,y1) and (x2,y2) are correctly provided wrt to the location of road in my NAD 83 system but are actually drawn in Europe as the graphics layer is working in the spatial reference of the basemap (WGS 1984). So the items are drawn correctly but instead of using NAD 83 for measurements, they use the basemap's projection.