Hacking GPS (ExtremeTech) by Kathie Kingsley-Hughes

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By Kathie Kingsley-Hughes

The data did not point out that the publication was once outdated by means of many years so many of the info used to be beside the point to present gps devices and TomTom is only pointed out. lots of the info is seriously orientated to Garmin.

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FIGURE 2-24: T6 Torx bit 2. Unplug the cradle from the PC. Undo the screws (see Figure 2-25) and be sure to keep them safe. 3. Once all four of the screws are out, start taking the plastic parts apart. This should be quite easy to do and requires no real force or pressure. Make a note of how it all comes apart for reassembly and be sure not to lose any of the springs. eBook-LinG Chapter 2 — Building GPS Data Cables and Power Cords FIGURE 2-25: You need to undo these screws. 4. The bit inside that you are interested in is the little circuit board that plugs directly into the iPAQ serial port when it rests in the cradle.

If it isn’t, add an inline fuse (using a 5-amp fuse). Testing Make sure you use your multimeter to verify that the output voltages are correct and that there are no short-circuits that could blow the GPS unit. eBook-LinG 31 32 Part I — Hardware Hacks -ve +ve +ve -ve FIGURE 2-22: Cigarette socket detailed When it’s not plugged into a GPS, make sure that the cigarette adapter isn’t plugged in, as that makes the pins of the GPS connector live. If those live pins come into contact with metallic objects, they could cause sparks, damage, and possibly a fire.

Strip the ends of the wires, as shown in Figure 2-6. eBook-LinG Chapter 2 — Building GPS Data Cables and Power Cords 4. Using a multimeter, you need to determine which wires corresponds to the data in and data out and ground pin on the 9-pin connector, as shown in Figure 2-7. To do this, set the multimeter to “ohms” (the 20 ohms setting will do just fine). Attach one probe to the bare wire; wrap a length of paper clip around the other probe, and probe the holes in the connector. Try them in turn; you are looking for a reading of zero, indicating that you have the right wire for the pin.

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