GPS World, September 2011
TRANSPORTATION Marine FIGURE 1 FIGURE 1 Reported positions from one of the typical marine grade receivers installed on the vessel An erroneous GPS position red circle is compared to the corresponding eLoran position green square The GPS position is reported as being inland 22 km west from the true eLoran position Red lines indicate the boundaries of the main lobe of the jamming unit and position colors indicate reported speed blue 15 knots yellow 50 knots orange 100 knots and red 100 knots FIGURE 2 Newcastle FIGURE 2 Erroneous AIS positions reported on the radar onboard NLV Pole Star The bottom circle highlights the radar return for a nearby vessel while the top circle highlights the reported AIS position for that vessel which is clearly reporting an erroneous GPS position caused by jamming GPS World September 2011 www gpsworld com 52
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