Reply to post: Deja vu

Navigating without GPS is one thing – so let's jam it and see what happens to our warship

Mike 137 Silver badge

Deja vu

An exercise like this was done by Trinity House some time back (I forget when exactly but around 20 years ago). They sailed a trawler up and down past Grimsby and jammed its GPS signal (awfully easy to do). There were two interestig findings: [1] at one point it broadcast that it was doing around 200 knots over land, and [2] the "fallback" radar navigation system didn't work because it used the GPS clock for synchronisation.

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