Reliable GPS backup

We rely too heavily on GPS devices, according to scientists:

Developed nations have become "dangerously over-reliant" on satellite navigation systems such as GPS, which could break down or be attacked with devastating results, British engineers said Tuesday.

The Royal Academy of Engineering said the application of the technology was now so broad -- from car sat-navs to the time stamp on financial transactions -- that without adequate backup, any disruption could have a major impact.

That's why I always travel with adequate backup. It's called a road atlas.