NavList:

Excellent point about the chronometer... I never thought about it like that! But you are missing one point... What of intentional action by the enemy? What if a hopelessly out performed military that have an exellent missile program but very little else feel a greatly technologically superior opponent is about to attack them... a technically superior opponent that is also a 'democracy' and this adverse to large scale civilian casualties. What is the likelihood they have already anticipated that their best chance of victory is to make a conquest so costly in terms of human life the democracy cannot do it. And what is the best way to make it costly? Well, if we were to take out the GNSS satellites then... We are almost back to ww2! That would do it... And at least China has already wargames this. It's an extreme situation, but one we need to plan for. Where we are now is if you had to leave the heart of your chronometer on a desert island in the middle of the Pacific. It will all work fine as long as no one manages to go there and smash it!