how to define global coordinate system in autocad map 2008

[oubbadah]

please, how to do this ,,we access that from map ---tool--define global coordinate system,,
for example:if I choose utm coordinate ,,and I have a geotiff image in utm ,,how to do this to get real destance in autocad ,,as arcgis
please ,,and thanks

[lpseifert]

If the tiff has a world file (.tfw) accompanying it , use Map's Image > Insert

[oubbadah]

thanks,,but i have a geotiff image in utm coordinate ,,before insert it ,we have to define global coordinate system ,,i have tryed but iam off,, how to do this

[rustysilo]

Have you verified your units as well?