Fun fact: GPS uses 10 bits to store the week. That means it runs out... oh heck – April 6, 2019

Nav gadgets will be Gah, Properly Screwed if you don't or can't update firmware

Older satnavs and such devices won't be able to use America's Global Positioning System properly after April 6 unless they've been suitably updated or designed to handle a looming epoch rollover."