Couple of things, firstly I have been using GPS (For work) since they came out commercially available, only once has it stopped working, just after they first started being used, that was for half an hour. That's since around 1991. Next VFR flying is just that, looking out the window. If you are worried about flying into rising ground then knowing LSA won't have any impact, you shouldn't be flying that low. Yes I know weather can throw curved balls, training should cover this.