Car Satellite Navigation

If you drive in Europe, then the first question that comes to mind... Will you reach in time ? Can I navigate through the roads like the one below:


You need a Satellite Navigation system ( for autos Automative Navigation System)

What is Automative Navigation System ?

An automotive navigation system is a satellite navigation system designed for use in automobiles. Unlike other GPS systems, these use position data to locate the user on a road in the unit's map database. Using the road database, the unit can give directions to other locations along roads also in its database.

How does Satellite Navigation System work ?

GPS : GPS is the world’s first satellite navigation system. It was developed by the U.S. Government’s Department of Defense, who gave GPS its official name: the NAVSTAR system (Navigation Satellite Timing and Ranging).

GPS consists of 3 key elements:

• Satellites in space
• Monitoring Stations on Earth
• And last but not least, you and your GPS receiver.

GPS signals

Your GPS receiver picks up signals from GPS satellites to work out your location. The last, important step in the process is of course you making use of that information.

Each satellite transmits low power radio signals on different frequencies for different users. The signals travel by so-called ‘line of sight’. This means they pass through clouds, glass and plastic, but not usually through solid objects, such as buildings.

How the Navigation Device tells you exactly where you are ?

  1. The location of the satellites: To work out where you are, your navigation device needs to know two things: a. The location of at least four satellites above you, b. Your distance from each of those satellites
  2. The distance of the satellites: A navigation device works out its distance from a GPS satellite from the time it takes the signal to travel to the receiver from the satellite
  3. The fourth satellite: In satellite navigation perfect timing is everything; the fourth satellite checks the time measurement of the other three satellites to make sure the information about your location is as accurate as possible
  4. Atmosphere-induced error & Multipath error : So we’ve got perfect timing and we know the satellite's exact position. But up to now our calculations have been based on the speed of light in a vacuum, the only place where the speed of light is a known constant
The GPS module in your Sat - Nav device makes sure that the satellite signal is translated into co-ordinates pinpointing your exact location on the map.

Once everything has been ‘started up’, the GPS module in your device calculates where you are from the satellite signals it receives. The satellites constantly send out signals and the module picks up those that are nearest to it.

As you know, the GPS module works out its position by calculating its distance from at least four different satellites. But while your Sat-Nav device may know its distance from these satellites, it still doesn’t know exactly where you are until it also knows where the satellites are positioned. Even then it’s not straightforward, as each satellite is constantly moving in orbit around the earth.

This last problem is solved by the fact that the GPS signal the satellites send out contains so-called ‘almanac’ information. Information about such things as the altitude of the satellite, which satellite it is, its position in relation to the other satellites, and so forth. Using this information, your GPS module can translate these signals into co-ordinates, which it then sends on to the navigation application.

Which is where your GPS module really comes into its own. Inside the module is a small, highly sensitive GPS chip that can receive and register signals even when it’s in very inaccessible locations, such as down narrow alleys, amongst high buildings or in dense woods. Which obviously greatly improves the accuracy and consistency of your Sat Nav device.

What you should look for when buying a Sat-Nav ?

Base Level Product

  • Features and Benefits:
  • Easy to use satellite navigation system
  • Just plug in and drive
  • Up-to-date maps by country/region
  • LCD touch screen
  • Door-to-door planning
  • Lightweight, portable wallet-sized unit
  • Stylish design
  • Internal rechargable Li-ION battery
  • USB port
  • High resolution graphics
  • Fast GPS signal fix
  • Full postcode navigation
  • Optional warning when exceeding speed limit
  • Route planning based on desired arrival time
  • Fastest, shortest or avoidance route planning
  • Itinerary planning
  • Points of interest locator
  • Built-in Bluetooth® technology

High End Product will include

  • HOME dock, for PC downloads
  • Integrated hands-free calling functionality
  • Call pick-up function
  • Travel guide
  • Pre-installed safety camera database
  • Pre-loaded multi-continental map coverage
  • Fully integrated MP3 player
  • High quality speaker
  • Jukebox music manager
  • Test-to-speech functionality
  • Optional iPod control
The best product available in the market in Tom Tom and Garmin

See the full video demo Pioneer AVIC-HD1BT - In Car GPS and Entertainment.

If you want to make your drive comfortable... then go for Sat-Nav devices.


Santosh Puthran


How does Tom Tom work ?

Current and proposed satellite navigation systems


Indian participation in GLONASS

Look for TomTom
Digital Shop, UK

or Garmin

Digital Shopping, US

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