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    GPS – A Short Introduction

    GPS, which stands for Global Positioning System, is a satellite navigation system that can ascertain the latitude and longitude of a GPS receiver device on the Earth.  The GPS consists of more than two dozen global positioning satellites orbiting the earth. Each satellite transmits radio signals, which can help determine the location, speed and direction of travel of users equipped with GPS receivers. To ensure that the whole world is covered by the constellation of the GPS satellites, they are so arranged that four satellites are positioned in each of six orbital planes.

    GPS Tracking

    GPS tracking depends on the same principle that all other forms of location tracking depend on: triangulation. Triangulation refers to the practice of using three or more sensors, which are GPS satellites in the case of GPS tracking, to measure an object’s distance from each of the sensors and calculate the object’s relative position based on each of the sensor’s location.

    A GPS tracking unit can determine the precise location of any individual or vehicle carrying the GPS receiver, which can be a dedicated GPS receiver unit, a smartphone, or any other device that is equipped with GPS technology.

    The location of the object or individual being tracked is often recorded at regular intervals. Recording of an object can take place within the GPS receiver unit, or can be transmitted to a central location such as a database, where it can be accessed either via mobile technology or over the internet. GPS tracking systems can typically be viewed in real-time and have a map in the background to display the current location of an object.

    Three Types of GPS Tracking Units

    GPS tracking units are divided into three categories, based on the techniques of data logging and retrieval.

    Data Loggers

    A GPS data logger logs the position of the object at regular intervals and stores the information in flash-based memory. Data on the memory can be retrieved or transferred to other stores with the help of available USB connectivity. Such devices are suitable for long distance hikers and cycling enthusiasts, who can make use of the logging facility to chalk out future routes to be followed.

    Data Pushers

    The GPS data pushers are popular for security purposes. This unit sends data from the device to a central database at regular intervals, updating information on location, direction, speed and distance.

    Such devices are suited for monitoring fleets of trucks and delivery vehicles. Vehicles can be located instantly in order to carry out effective supervision and prevent theft.

    Since it is easy to track movements of individuals or vehicles carrying valuable items, GPS data pushers are often used for spying.

    Data Pullers

    A GPS data puller allows the user to ‘pull’ data from the receiver as frequently as needed. The device remains on at all times. Though it is not as commonly used as the pusher device, it is particularly useful for tracing stolen goods. A mobile phone with integrated GPS can reply to an SMS from the data puller. This technology finds use in situations where tracking is required to be done only rarely.

    Applications of GPS Tracking

    GPS tracking can be used for a wide variety of applications, but are most commonly used for navigation, loss prevention, and identification.


    Large companies often use GPS tracking to track their distribution vehicles around the world. GPS tracking is also ideal for personal navigation because they can determine the user’s location anywhere in the world. Personal GPS tracking units used for navigation are widely integrated into smartphones and vehicles and are able to track the user’s movement in real time across a map. Since GPS technology is able to identify a user’s relative position within several feet of their true location, personal GPS tracking units are a very popular form of navigation.

     Personal GPS Tracking Units

    Loss Prevention

    In addition to navigation, GPS tracking units can be used in loss prevention to identify a lost or stolen item’s location. For example, GPS tracking units are commonly installed in vehicles in order to locate stolen cars and find the thief. GPS tracking units that are used for loss prevention rarely sound an alarm so that the thief does not know that he/she is being tracked. However, the GPS tracking unit can alert the vehicle’s owner by alarm or text message in order to inform him/her that his/her property has been stolen. Likewise, the GPS tracking unit may be activated from one or more remote locations. For example, OnStar vehicles are equipped with GPS tracking units that OnStar personnel can remotely activate.


    As well as navigation and loss prevention, GPS tracking units can be used to identify a user who is accessing a specific system or entering a specific area. For example, a user may have a GPS tracking unit installed in his/her doorway and use a remote GPS identifier to allow an authorized individual to enter the building without sounding an alarm. However, if an individual enters the building without a GPS identifier, the alarm will sound and law enforcement may be called.

    Shortcomings of GPS Tracking

    GPS is only able to identify an object’s location within several meters of its exact location. While this is not a concern for tracking an object on a large scale, GPS tracking is not reliable for small scale applications such as identifying an object’s exact location within an office building or warehouse. However, RFID is ideal for these applications and can work in conjunction with GPS tracking equipment.

    In combination with certain applications GPS tracking can also cause privacy concerns on the part of those being tracked. For example, some smartphone applications could send location information to their developers, the carrier or the manufacturer of the device. The extent of the concern will depend on how anonymous the location data is deemed to be, and for what purpose is the data being collected.

    Counter Measures to GPS Tracking

    The subject of GPS tracking has been hotly debated, because of the potential breaches of privacy.

    There are not many counter measures that can be taken to guard against unwanted GPS tracking. One possible counter measure is jamming the GPS signal; however, this is illegal in many countries, because of the possibility of affecting a wide range of signals that might be legitimately used, as those used by aircraft. Another counter measure is to use a device that can ascertain when radio signals are being sent or if a GPS device is present on a person or asset. However, most cell phones and other consumer electronics usually include controls to disable the function of GPS tracking.

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    1. JSB

      16 May, 2012 at 4:39 am

      Are there any systems that are low cost. But, it allows you to detect ANY GPS signals in a designated/ open areas.(search and rescue type aspect.

      Are there any Satellite system that are similar to Global Earth. That can Provide low cost, Real time viewing of a place of your choice and possibly at a time of your choosing. Even rewinding in time.

      Thanks for any help.

    2. Akpakpan patrick

      18 April, 2012 at 11:55 am

      Pls i need help. I’m working on a project title CRIME CONTROL AND DETECTION, and i intend using GPS as a tool used in detecting crime. Can anyone give me a load down of how it might work.

    3. dharmendra singh

      18 November, 2011 at 7:31 am

      how does a GPS  tracking system defined vehicle speed. 

      • OPAL Solutions

        6 August, 2014 at 7:17 am

        the settings are custom,, By default GPS Trackers define KMPH.
        Thank you

    4. b.s.saini

      20 October, 2011 at 6:28 am


      • b.s.saini

        20 October, 2011 at 6:38 am

        recently a small child of about ten years was kidnapped and killed.superintendent of police gave an article in times stating that to help tracking in such situation gps device could help.i would like to know what is gps enabled sim.HOW will it work and how can it be used for children or someone at such risk.

    5. sparsh shukla

      23 September, 2011 at 4:02 pm

      pdf and synopsis of gps &gsm vehcle travel location data logger& real time tracking

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