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Data Hacking

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Chapter 10 — More <strong>Data</strong> Tricks<br />

GPGGA: Provides accurate timing information and is commonly output by GPS<br />

receivers<br />

GPRMC: Also provides accurate timing information and is commonly output by GPS<br />

receivers<br />

GPZDA: Provides both time and date information but is not usually output by many<br />

GPS receivers<br />

FIGURE 10-25: Choosing the appropriate port settings<br />

FIGURE 10-26: NMEA sentence options<br />

There is also the “Hardware 1 pulse per second” setting to consider (see Figure 10-27). When<br />

this check box is selected, NMEATime waits for the RS-232 DSR (<strong>Data</strong> Set Ready) or CTS<br />

(Clear To Send) line to change state before setting the PC clock. If the GPS receiver outputs<br />

a 1PPS signal, this signal can then be fed back to the DSR or CTS line to maximize synchronization<br />

accuracy.<br />

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