How do ships navigate when GPS is jammed and why does it happen so often now?

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Why does a fully laden tanker need five kilometres to come to a stop? Squat effect: why does a ship in a narrow channel get sucked toward the bank? How does a thirty-tonne anchor hold a ship in a gale? Bulk carriers break in half when cargo shifts — what loading mistake causes it? Bow thrusters and tugs: how does a 400-metre ship dock without touching anything? What does a bridge crew actually do when a storm hits the Bay of Biscay? How does GPS know exactly where you are? Level crossings kill more people than train crashes do — so why are thousands of them still open? How does clear-air turbulence form on a cloudless day and why can nobody see it coming? Guardrail choice: what decides whether a barrier bends or stops the car