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Data Hacking

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298 Part IV — Playtime<br />

To summarize, you will need the following:<br />

2 GPS receivers<br />

2 FRS two-way radios<br />

Set of cables for connecting the units together (covered shortly)<br />

1 TinyTrak3 kit<br />

1 TNC kit<br />

1 PDA (for viewing locations). The only ones I tested are Palm devices running 3.01<br />

they must have a serial port. Alternatively, a laptop will do.<br />

The TinyTrak3 is a GPS position encoder and is available from www.byonics.com/tiny<br />

trak in various forms (kit or ready-made). Prices start from $36 for TinyTrak3 in kit form.<br />

After you have assembled the TinyTrak3 (it requires soldering but nothing difficult is involved),<br />

you can program it by connecting it to a PC via a serial port and running the configuration<br />

software, shown in Figure 12-6.<br />

FIGURE 12-6: TinyTrak configuration software<br />

Some important features of the configuration interface include the following:<br />

Callsign: If you are using the system with an amateur radio kit, this is where you would<br />

put your FCC callsign. If you are only using FRS two-way radios, you can put any sixcharacter<br />

ID here.<br />

Digi Path: The default value of WIDE2-2 is correct for this.

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