Sorry, Just realised that the values given in my opening post were simply duplicated ... tried to go too quickly.
Input values LatLng -> pixels Latitude : 41.850033 Longitude : -87.65005229999997 Zoom Level: 0 Pixel output : X : 65 Y : 95 Now conversion back to Lat/Lng Latitude : 42.032974332441 Longitude : -88.593750013843 Is this simply a question of the fact that we loose the decimal values for pixels and therefore cannot have sufficient accuracy ? -- You received this message because you are subscribed to the Google Groups "Google Maps JavaScript API v3" group. To post to this group, send email to google-maps-js-api-v3@googlegroups.com. To unsubscribe from this group, send email to google-maps-js-api-v3+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/google-maps-js-api-v3?hl=en.