Geographic Transformations from NAD83 to Mercator

Discussion created by cyohman on Apr 22, 2010
Latest reply on Apr 22, 2010 by MKennedy-esristaff
I was wondering about Geographic Transformations from NAD83 to World_Mercator (WGS84).

These are the transformations listed in the Projection Tool and in C:\Program Files\ArcGIS\Documentation\geographic_transformations.pdf . The file has been attached. Pages 24-25.

NAD_1983_To_WGS_1984_1 1188 Canada, Central America, Mexico, and United States (Alaska, CONUS)
NAD_1983_To_WGS_1984_2 1251 United States - Alaska - Aleutians
NAD_1983_To_WGS_1984_3 1252 United States - Hawai'i
NAD_1983_To_WGS_1984_4 1308 United States - CORS ITRF94
NAD_1983_To_WGS_1984_5 1515 United States - CORS ITRF96
NAD_1983_To_WGS_1984_6 1696 Canada - Quebec
NAD_1983_To_WGS_1984_7 1697 Canada - Saskatchewan
NAD_1983_To_WGS_1984_8 1702 Canada - Alberta

None of them deal with the world outside, more or less, North America. Is there one that does? Should I use a projection other than World_Mercator?

Thanks for reading and in advance of answers.