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Simple guidelines to follow when choosing a Navigation GPS unit.
There are two basic types of vehicle GPS units: in-dash and portable. An in-dash Navigation GPS unit is installed in your dashboard and is not removable. The advantage is that there are no extra wires or power adapters to mess with; the downside is that it requires professional installation, which comes at an additional cost, and once it’s in, it’s there to stay.
Portable GPS navigators are the most popular category, because they are cheap, effective and can be moved easily from car to car.A portable vehicle GPS unit sits on your dashboard with the help of suction cups or some kind of adhesive. It requires a clear view of the sky through your windshield in order to get a good signal, so it may be difficult to see from the driver’s seat. Portability is the advantage: you may transfer your Navigation GPS unit between vehicles. Dashboard GPS units also rely on speech recognition and speech simulation features more than handheld's because they are designed for hands-free use in a car.
Satellite navigation used to be the exclusive domain of very expensive cars. Now anyone can afford one. The way it works is incredible: it picks up signals being constantly pinged to earth from 30 global positioning satellites orbiting the Earth and works out based on the fractional delay in signals from different satellites exactly where you must be. The satellites were launched into the space by the United States for military purposes in 1973, but have since been opened up for civilian use.
Map updates are another area to be aware of. It is far more important on an electronic navigator to have an up-to-date map than the old days of street directories. It can be significantly dangerous if your navigator suddenly instructs you to turn right while you are travelling over a newly built bridge, or tells you to turn into a street that used to be two-way but has since become one way. Some lesser known budget brands of navigator may not provide easy map update options, whereas the more established brands will.
Do you need Bluetooth?
Some navigators have Bluetooth built in, which allows you to connect your Bluetooth-compatible mobile phone and use the navigator speaker as a hands free telephony device.
Reversing cameras
GPS can be connected to a small camera on your windscreen providing a view out the back of your car. This is very handy for parking and spotting small children before you run them over!
Music/photos/video playback
In the cut-throat race for supremacy in the GPS navigator market, some manufacturers have started adding iPod-style features to their navigators, including music, photo and video playback. It might be more useful to you if the GPS navigator you are looking at has an FMT audio transmitter to the car-stereo, for example, rather than just using the in built speaker.
Accessories:
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