Sat-Nav threat from jammers

BBC news reports on concerns that not only sat-nav users, but also critical national infrastructure is at risk from attack from widely available jamming equipment.

Jamming of GPS systems can be achieved using very low power equipment.

An article 'Potential interference To Galileo From 23cm band operations' mentions that a jammer running just 2 milliwatts is reported to have disrupted GPS operation over a 1 nautical mile radius in a sea trial, see
http://www.southgatearc.org/articles/galileo2.htm

The BBC news article 'Sat-nav systems under growing threat from 'jammers' by Jason Palmer can be read at
http://news.bbc.co.uk/1/hi/sci/tech/8533157.stm

Radioactive Networks - GPS Jamming
http://www.radio-active.net.au/web/gps/jam.html

Southgate 2007 - BBC News - MoD set to block sat nav systems
http://www.southgatearc.org/news/june2007/
mod_gps_jamming.htm

Global Positioning Systems (GPS)
http://www.southgatearc.org/guides/gps/gps1.htm