ok ive got primo installed but it seems to about 1000' off in its calculations garmin takes right to the spot .never used tom tom . the biggest trouble im having is i do about 95 % of my driving is off road the garmin dose a fair job with the county roads but lacks some features this unit claims to be able to use other maps like igo/garmin /sygic/kudos but cant seem to find the maps or how to use them .what im trying to do is igo primo for on road and one of the others for off road