To answer your points 1. WWWVB is the norm. When they say 'Atomic Clock' they are using WWVB to synchronise time. 2. Putting GPS on a consumer electronic woul

To answer your points 1. WWWVB is the norm. When they say 'Atomic Clock' they are using WWVB to synchronise time. 2. Putting GPS on a consumer electronic would be WAY more expensive. 3. WWVB covers Continental US and Southern Canada. https://en.wikipedia.org/wiki/WWVB#Propagation https://en.wikipedia.org/wiki/WWVB#Propagation