Buying a Satellite Navigation (Satnav) System for Your Car

Once they were only for the rich and were only fitted in the very high end cars but today SatNav systems are available to all. You can either opt for the in-car fitted systems that are still quite expensive or you can go for the handheld or protable units. This article is about the latter.

What is SatNav?

SatNav is a system that comprises of 2 elements, a GPS data receiver and a CPU/display unit. The receiver gets information from orbiting GPS navigational satellites and communicates it to the CPU/display unit. This unit is then able to find its exact location on the planet by comparing signals from various satellites.

The unit incorporates road maps of the area and places an indicator on the map showing where the car is on the maps.

Features

The units allow you to plan a journey ahead of time and then the unit will guide you to you destination by displaying a map showing you where you are and the direction you should be heading. Most now have voice instructions so the unit will tell you, when you are approaching a junction, which turning you should take. The units are also capable of making real time adjustments to the route, this means that if you go the wrong way the until will recalculate the route to your destination taking into account the wrong turning you have just made.

Maps

The maps for the unit can be loaded for the different regions you visit, so they may have a map of the UK and another for France and so on. Most modern unit have the maps stored on a removable memory cards like SD cards or similar memory card but some units read directly from a CD or DVD. The display can be set to show the conventional flat map view or the new 3D view that shows a view as if it was above you and looking forward. This view is very good and clear.