Ha! GPS woman took us down an old logging road down in Alabama a while back. Road turned into a road that hugged the edge of a deep ravine, then into a deeply rutted out cow path that we could barely get past. If we’d had to back the four or five miles out of there, we’d still be stuck at the deep rut. - Guess “Miss Know It All” GPS talker hadn’t got the word that this “road” was impassable.
Not complaining; just speaking truth to power. Heh.
I borrowed a TOMTOM for my first couple of runs until I realized TOMTOM does not save in favorites, remote locations.
123 Main St., Anywhere, USA is fine, but punching in W and S co-ordinates will GET you there, but once there, when you "save my location" to favorites, and try to use that to return again, TOMTOM says, "No route planned" ... so I switched to Garmin. (Magellen was more expensive)
ALL GPS seems to "lag" a little if you drive too fast or you don't look at the map and co-ordinate what you're doing with the highlighted path.
I listen to the voice prompts, but in strange areas, especially multi-turned city directions, I synch voice with the map.
I think your friend was guilty of not upgrading the system ... Off the shelf GPS can be a year or more old.