Why you should care about GPS in mobiles

Why you should care about GPS in mobiles

Summary: GPS-powered mobile devices are rare in Europe today, but that could be about to change

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TOPICS: Tech Industry
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You are probably familiar with the Global Positioning System, or GPS, as the system that tries to tell drivers the shortest way from A to B, or tracks goods in transit. However, although people in North America and the Far East have had GPS in their mobile phones for years now, such devices are still rare in Europe.

This situation may be about to change, though, as manufacturers and operators finally put their heads together to make it happen.

What is GPS?
Developed by the US military, GPS (officially called the Navstar GPS) involves a series of two dozen or so satellites orbiting the earth. A receiver on the ground will then communicate with one or more of these satellites, receiving their locations at precise times to work out its own location.

Isn't there a European alternative?
There will be: Galileo. It should be up and running by the end of next year, and companies such as Cambridge Silicon Research are already working on chips that can talk to both GPS and Galileo. The Russians are also dusting off their old Glonass system for 2010, and some suggest China could try extending its Beidou satellite constellation.

For now, let's take "GPS" to mean global navigation satellite systems in general.

Why would I want a GPS receiver in my phone?
For the same reason you would have one in a car, for one thing — as a guide. Think of it as sat-nav for walking. GPS-enabled handsets also open up all sorts of possibilities for advertisers, who would love to have you walking past a store and seeing their deals popping up on your screen. The UK is one of the most mapped nations on Earth, yet we don't make much use of that information.

The system has many advantages for companies managing field workers, or parents tracking their kids (see below).

Can't all that be done already, through mobile phone signals?
Up to a point. Triangulation (establishing your location by measuring the distance between you and three points of known location) does work fairly well with mobile phone masts by measuring time and signal strength. GPS is a lot more accurate though, pinpointing location to within five metres compared to the tens of metres you get with GSM triangulation.

However, GPS can be the worse option in an urban situation, as it does not work indoors. Cities also have a high density of mobile cells, a situation which favours mast triangulation.

Why has it not taken off here?
One reason is the cost of the chips, currently around £3-£5. This will probably change over time. Cambridge Silicon Radio, for example, now claims that adding GPS to a phone could cost just 50p if the technology is integrated into one of its Bluetooth chips. GPS also requires a rather awkward (by European fashion-phone standards) antenna, and chews up both bandwidth and batteries.

The big barrier, however, is a willingness on the part of the operators to see GPS integrated into their handsets. Demand for location-based services is far from proven, and a killer application still needs to emerge which will turn such services into guaranteed cash. Of course, that won't happen unless the necessary technology is available, making this a classic chicken-and-egg scenario.

Why have the Americans and Japanese legislated for having GPS in phones?
So that the emergency services can trace anyone calling them from a mobile phone, who might not know where they are. Fears of kidnapping have also led some parents to track their children using GPS.

Needless to say, this all raises interesting questions about privacy, although carrying a phone already means you can be tracked to some degree of accuracy.

When might Europe's attitude to GPS in phones change?
Possibly quite soon. The UK's National Physics Laboratory is gathering the key players to a meeting on Thursday to debate the problem, and we'll be there to cover the event.

Topic: Tech Industry

David Meyer

About David Meyer

David Meyer is a freelance technology journalist. He fell into journalism when he realised his musical career wouldn't pay the bills. David's main focus is on communications, as well as internet technologies, regulation and mobile devices.

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4 comments
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  • YAY!!

    Cant wait for this :D
    currently using a bluetooth gps device on my N70 and trying to charge both at the same time is a pain not to mention when bluetooth decides to drop the connection or refuses to pair :(
    lightfast-c685b
  • Privacy

    I wonder what will be done with all this GPS information? It would not be beyond the with of man (or a phone company) to record all this information and be able to track your movements. Do you *really* want adverts coming up on your phone telling you about the half-price golf sale just round the corner?
    samtheman1k
  • Good in theory

    I think having GPS available on mobiles would be a good idea - but i doubt whether it will really take off and be used frequently/successfully in the UK (and Europe for that matter).
    modafo
  • GPS on mobile phones ? = not new

    I've been using a Motorola A1000 for over 2 years with built in GPS. This device has access on online maps, I have loaded lots of details maps for hill walkiing and have Tom-Tom navigation software running to provide road directions.

    Prior to the A100 the A910 /A920 also has built in GPS receiver.

    As for using it it locate/track the device (only bad when misused) - the phone companies can do this pretty accurately using triangulation from multiple base stations (cells) without using any GPS.
    Mahame