Japan launches sovereign satellite navigation network as GPS cannot reach all of its country

Mountainous terrain and densely packed city blocks across Japan can obstruct ordinary satellite positioning signals from reaching receivers on the ground. Standard Global Positioning System coverage was never built with those obstacles in mind, leaving gaps in accuracy across parts of the country. Japan has spent more than a decade building its own answer to that gap, and this week that effort reached a new milestone. More

(Source: TechRadar - Aug 15)