I write on find some coordinates from greek grid and the arcgis explorer displays them 500 meters away southwest. What is wrong? (i have choose greek grid in display)
When I Greek Grid with the sample data you sent I believe I did not see any issues with mis-alignment of data...
Here are the steps I took (IN ARCGIS EXPLORER 1500):
1. Open ArcGIS Explorer 2. Set the Basemap to Bing Aerial imagery 3. Click the Explorer button/pearl in top left corner 4. Choose Map Properties 5. Select 2D Coordinate system tab 6. Pick �??Greek_Grid�?� from the drop down (via <More...> option) 7. In the Geographic Transformations box choose GGRS_1987_To_WGS_1984 8. Click OK 9. Click Add Content > Raster Data... 10. Browse for �??n.gonia_sdian63_58apo1.tif�?� 11. Click Open 12. This looks OK to me?