from the BBC...
CLICK HERE to read the article.Sat-nav systems under growing threat from 'jammers'
Technology that depends on satellite-navigation signals is increasingly threatened by attack from widely available equipment, experts say.
Ian
CLICK HERE to read the article.Sat-nav systems under growing threat from 'jammers'
Technology that depends on satellite-navigation signals is increasingly threatened by attack from widely available equipment, experts say.
The way it works is this: Dave stands in a spot with his laptop and his GPS receiving rod, which speaks to between four and seven satellites overhead, which give his position within two to three metres.
Then, in his backpack, there is a mobile phone that sends the same information to some 100 OS ground stations all over the country - they are accurate to a couple of centimetres.
Make a change to your home and the OS will map it, from an extension to a garden pond.
MasterMap, the UK's first comprehensive digital updateable database, contains 440 million features - from lamp-posts to post boxes.
Places such as these, which have no postal address, still need to be logged, says the OS.
And yet, according to Robin Heath, they are no longer going to be recording churches spires or many 'less significant' ancient sites on OS maps. What gives?Make a change to your home and the OS will map it, from an extension to a garden pond.