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Cynical prediction: A trillion or so dollars just moved around various stock exchanges arbitraging between GPS timebased and non-GPS timebased stockmarkets...

Time arbitrage is mostly at the millisecond time scale, not microsecond. For instance there is massive investment in microwave data transmission between New York and Chicago. Microwaves in air go close to speed of light in vacuum, while the more typical fiberoptic data links are at the speed of light in glass, about 30-some percent slower. The microwave links beat the fiberoptic by about 2 milliseconds on New York to Chicago, which is enough to arbitrage between markets located in those places.

SVN 23 was decommissioned on the 25th

http://www.navcen.uscg.gov/?Do=gpsShowNanu&num=2016008

For reporting actual, demonstrable GPS constellation errors only (not equipment or user issues):

mailto:pnt.office@gps.gov

via http://www.gps.gov/support/contact/

(Folks at shops like Trimble and Garmin already have contacts within their respective orgs, so employees should try to work with their channels where possible.)

How often does this kind of thing happen? and what are the practical consequences?

GPS jumps of -13.7 us?