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Data Hacking

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FIGURE 9-11: Adding errors to the simulated GPS data<br />

Using NMEA<br />

Chapter 9 — Examining the <strong>Data</strong><br />

But what can you actually do with NMEA? All these sentences containing information are a<br />

method of communicating the data displayed on the screen of the GPS. For what other, possibly<br />

more useful, purpose can we use NMEA?<br />

You can do two very interesting things with NMEA data:<br />

You can store the NMEA output of your GPS on an electronic device and use this as a<br />

record of the journey. As you will see, there are advantages to storing the data in NMEA<br />

format that aren’t immediately obvious.<br />

You can create your own NMEA data and store it in a file that can later be played back<br />

to other applications, which will believe that they are receiving data live from a GPS,<br />

when in fact they are receiving only fake data.<br />

GpsGate<br />

A variety of applications can effectively work with NMEA, but one of the best and most versatile<br />

in called GpsGate.<br />

GpsGate is published by Franson Technology AB, and is available for download from<br />

http://franson.biz/gpsgate. GpsGate is a commercial application available in two<br />

versions: Windows, shown in Figure 9-12, and the Pocket PC, shown in Figure 9-13.<br />

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