The Global Positioning System, or GPS, is a cutting-edge technology
available for your vehicle. Automotive GPS uses satellite positioning to
track your car's location and help you map the distance and directions
to your destination. Some provide handheld PC- or PDA-based text
information, while others feature color screens with maps that are
integrated into your car dash or console.
For PC- or PDA-based models, upgrades can be downloaded regularly to
keep you abreast of road conditions, construction and detours. In
addition, computer-generated vocal instructions can be broadcast though
external PDA or PC speakers. Automotive GPS navigation systems typically
stand alone and don't require a PC or PDA. Today, many high-end vehicles
come with GPS already installed, and it can be added to most cars
aftermarket as well.
Automotive GPS systems also include voice response-only systems.
These don't provide visual maps or directions. Instead, they offer a
push button for immediate connection with a live person who will guide
you to your destination.
When shopping for a GPS system, it's important to ensure the system's
accuracy. The system should be correct to within 5 meters or
less--keeping in mind that this number may increase due to unavoidable
factors like extreme weather, satellite repositioning, and even loud
noise interference. Also, the system should be able to be regularly
updated for changes in street names, detours or construction. Lastly,
the directions for frequent trips or at least your typical point of
origin (i.e. home, work, or school) should be retained or programmable.