You are supposed to lose nothing, but the colored maps. I think maybe it doesn't show the traffic on the map, but you still get traffic routing, so with a wifi hotspot, aside from the annoyance of having to turn wifi on each time you move the drive stick and having to reboot the touch screen when it decides not to connect to wifi, you really lose nothing except colored maps and I can't justify 12 a month for colored maps, although it does aggravate me that a honda civic with navigation has better maps than me.