> Edit: I just noticed that Stephenson gives GPS fixes to absurd precision (10 microarcminutes, or about 1.6 cm—on the ocean with a civilian GPS receiver in 199

> Edit: I just noticed that Stephenson gives GPS fixes to absurd precision (10 microarcminutes, or about 1.6 cm—on the ocean with a civilian GPS receiver in 1996, before GPS Selective Availability was turned off). It would seem GPS Selective Availability has been disabled since 2000 [0]. [0]: https://en.m.wikipedia.org/wiki/Error_analysis_for_the_Global_Positioning_System#Selective_availability https://en.m.wikipedia.org/wiki/Error_analysis_for_the_Globa...