An alternative solution
In order to lessen our reliance on these GPS signals and help avoid an electronic arms race between jammers and counter-jammers, how's about this for an alternative:
Large metal boards could be erected at intervals alongside major roads, listing place names of locations the road leads to. Numbers placed next to the place names could give an indication of your current distance from that location. At junctions, the boards could employ arrows to indicate alternate destinations along each route leading from the junction. Again numbers printed beside the destination names could indicate the current distance from that location.
On a more localised level, these boards could be replicated at a smaller size at the ends of streets and could, in these cases, give the name of the street in question. In order to avoid the motorist having to memorise each of these smaller street-naming boards, diagrams could be published online, or on paper, showing the arrangement of streets within a locality.
The motorist could also be issued with half a brain-cell and or a piece of paper and a pen, to aid making a note of the location of the desired destination, for future reference, rather than relying, in every facet of their lives, on electronic gadgets to wipe their fucking arses for them.
I propose to call my invention the "Trouser Press".