Hi List, I am trying to find the A,B,C,D,E,F numbers for a customised projection in mapinfo. We are trying to do a conversion from UTM ED50 Zone 31 to specific site coords for a site in spain. We have our site 0,0 to equal 351483.2, 4558846.4 UTM ED50 Zone 31 Our datum number is 28 Our projection number (i think) is 8 Our angle of rotation is 82 degrees clockwise :) we don't understand how to do the matrix multiplication :( can anyone help us? we are desperate!!!! Any help would be greatly appreciated. Thanks :) Cathy
