“Unlike aircraft, ships lack a back-up navigation system and if their GPS ceases to function, they risk running aground or colliding with other vessels.”
Ermmm… How about Celestial Nav? I know, I know, we’ve been through the ‘yeah, what will you do when all the satellites fall out of the sky?’ line of thought before. But seriously, Is Reuter’s that stupid that they don’t know about this centuries old tool called a sextant and think we can’t find our way without a GPS?