11 Matching Annotations
  1. Aug 2020
    1. in June, 2017, a French oil tanker, the Atria, sailed across the Mediterranean, through the Bosporus strait, and into the Black Sea. As the ship approached the Russian city of Novorossiysk, the captain, Gurvan Le Meur, noticed that the ship’s navigation system appeared to have lost its G.P.S. signal. The signal soon returned, but the position it gave was way off. The Atria was apparently some forty kilometres inland, shipwrecked at the airport in Gelendzhik, a Russian resort town.

      This could easily be used to spoof tanker vessels and hijack them electronically.

  2. Jun 2020
  3. May 2020
  4. Apr 2020
  5. Jun 2019
  6. Sep 2018
  7. Jan 2016
  8. Nov 2015
    1. If the space doctor’s ideas were wrong, your phone wouldn’t be able to tell where it was.

      If all of the space boats travel at the same velocity and the same distance from the Earth's surface, the time shift of the on-board clock due to relativity would be the same. The difference between the clocks would be almost the same. How would the trouble appear?