There's an interesting debate going on in the US at the moment about Lightspeed. Lightspeed is a combination satellite and land-based 4G/LTE mobile broadband network. The frequency range that they've been allocated is adjacent to the range that the GPS systems operate on. Probably due to the strength of their signals, (compared to the relatively weak GPS signals) they seem to be interfering with GPS receivers. Lightspeed are planning to install 40,000 transmitters across the US. This could have a disastrous effect on civilian GPS receivers, affecting both car and aircraft navigation, and of course geocachers! Despite the GPS industry making representation to the FCC, they have given Lightspeed provisional approval to proceed. Lightspeed have suggested upgrading existing GPS receivers with filters to block the interference, and have offered to pay for government devices (military etc), but the general public would be on their own. When you think how many devices are GPS enabled (hand held receivers ,smart phones, laptops etc) the potential costs could be immense. Hopefully a situation like this will never happen in Australia, but it's interesting to note that that relative low strength of the GPS signal makes it susceptible to interference, both unintentional and intentional.
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