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GPS is only one of three currently deployed satellite positioning systems, why aren't planes using the others?


All of them share the same reciever and generally the same frequency bands. Jamming one, jams them all.


Wikipedia has this, is it wrong?

> An anonymous EU official claimed that the US officials implied that they might consider shooting down Galileo satellites in the event of a major conflict in which Galileo was used in attacks against American forces.[34] The EU's stance is that Galileo is a neutral technology, available to all countries and everyone. At first, EU officials did not want to change their original plans for Galileo, but they have since reached the compromise that Galileo is to use different frequencies.

> This allows the blocking or jamming of either GNSS without affecting the other.[35]




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