Next minute, FPGAhacker's GPS navigator directs him to drive into the local zoo's lion cage... (I don't have a reference handy, but I recall reading that if yo

Next minute, FPGAhacker's GPS navigator directs him to drive into the local zoo's lion cage... (I don't have a reference handy, but I recall reading that if you don't allow for time dilation effects of the GPS satellite's clocks moving faster in orbit than the ground below, you lose just over 10km of position accuracy per day.)