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Data Hacking

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FIGURE 8-8: Time zone<br />

information<br />

FIGURE 8-9: Daylight saving<br />

information<br />

Chapter 8 — GPS <strong>Data</strong><br />

Some GPS receivers, either when you buy them or when they have had exhausted batteries in<br />

them for some period of time, will ask you to input the time and date manually — this helps<br />

the receiver get a lock on the satellites, and the time will be corrected when the almanac has<br />

been downloaded.<br />

Waypoints<br />

A waypoint is a spot on the surface of the Earth as defined by coordinates that are inputted<br />

into the GPS and stored, usually along with an icon, a descriptive name, and some text.<br />

There are two types of waypoint:<br />

Manual waypoints<br />

On-the-spot waypoints<br />

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