Data Hacking

16 Part I — Hardware Hacks
FIGURE 2-3: Two GPS connectors
If you want to buy a cable for your GPS, most manufacturers make such cables available. They
aren’t cheap compared to making a cable yourself, but it is a quick option. Check the user manual
for details — most accessories are listed there.
Power Cords
If you have owned and used a GPS for any length of time, you know how often the batteries
need replacing just at a moment when you can’t replace them, such as while driving.
Power cords differ from data cables in that they are used to transfer power to the GPS unit
from a battery pack, a stack of batteries, or from an automotive circuit (commonly via the
cigarette lighter). Using a power cord while using your GPS in the car (or while on the move,
as I’ll show you shortly) can dramatically increase the lifetime of the batteries in the device,
saving you money (if you are using disposable batteries). It also reduces the load of spare batteries
you have to carry for a particular trip.
You do need to be careful with power cords. The automotive system is a 12-volt system, and
while some GPS receivers can handle this amount of power, some cannot.
Not all GPS receivers can handle a direct 12-volt power input and can be seriously damaged.
When in doubt, check!