LL coordinate system

[Usuario de GRASS 4]

I want to convert a scanned map (x,y coordinate system) into latitud/longitude
 coordinate system. With the i.points (i.rectify,...) command I can convert 
my map into the UTM coordinate system or the State Plane coordinate system 
but not into latitud/longitude coordinate system.
Does anyone know how I could do this?.
Thanks in advance.

Anabel Donadios
Eurogis