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Data Hacking

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220 Part III — <strong>Data</strong> <strong>Hacking</strong><br />

The file created will contain NMEA data similar to the output from a GPS, but this data is<br />

simulated and has not been generated by a GPS.<br />

<strong>Data</strong> Playback<br />

Now that you have the NMEA files, you can output the data. While some applications will<br />

accept NMEA directly, with GpsGate, as long as the application can take the data and output<br />

it to a virtual port from which the application can take the data, the application will treat the<br />

data as though it’s coming directly from a GPS, when it fact it’s coming from a log file.<br />

To set this up, follow these steps:<br />

1. Choose the output virtual port for the data by right-clicking on the GpsGate icon in the<br />

System Tray and choosing Settings.<br />

2. Fire up the application you want to send the data to and choose the virtual port and the<br />

incoming GPS data port (how you do this will vary from application to application, so<br />

consult your manual for details).<br />

3. Right-click on the GpsGate icon and choose Source ➪ NMEA Log. This will bring up<br />

the window shown in Figure 9-21.<br />

FIGURE 9-21: GpsGate NMEA Log playback window<br />

You can now control the playback of the log using the Play, Stop, Pause, Rewind, and Forward<br />

buttons. Clicking Play will output the NMEA log to the application listening to the virtual port.<br />

Why Bother with NMEA?<br />

You might be wondering why so many applications enable you to examine and record the<br />

NMEA sentences that come from a GPS. Are all these software programs and utilities driven<br />

purely by curiosity?

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