On Thu, 22 Dec 2011 09:02:43 -0500, Oscar wrote:

Position spoofing or more accurately Electronic Counter Measures is not
new. We've been using ECM since the 60s.

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Yes, that's mostly been with RADAR however which is a lot easier to
spoof than GPS. GPS relies on multiple, very accurate timing signals
which are synchronized with atomic clocks down to the range of
nano/micro seconds. RADAR signals operate mostly in the micro and
millisecond range and have no external time reference.