Though a shade under a grand might seem quite a sum for a little chip, so-called RTK (Real Time Kinematic) GPS systems normally run ten times that. To bring such tech down to earth, Piksi has launched its own RTK GPS receiver on a chip, giving UAV and rocketry hobbyists, researchers, surveyers, scientists and teachers a crack at centimeter position accuracy. RTK works by overcoming the normal limitations of GPS technology, namely the 300 meter bit-length and ionospheric delay, by using two receivers to mitigate those sources of error. That lets it position itself down to a single c
