I'm very new to GRASS.
I've imported some government files (from http://listdata.thelist.tas.gov.au/opendata/) that are available in ESRI and MapInfo format and they display successfully, and show coordinates in GDA94 / MGA zone 55, as expected.
I've also imported a CSV file with points in decimal degrees long and lat using:
v.in.ascii input="stops.txt" output=metro_stops format=point separator=comma skip=1 x=6 y=5 z=0 --overwrite
and I've imported a kmz file from Google Earth.
The points from the CSV file and the kmz file display with coordinates in decimal degrees, so they don't appear anywhere near the ESRI data.
I realize my problem is to do with telling GRASS the coordinate system of the data, or transforming it somehow, but I don't know where to look.