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A comment on Reduce GPS data error on Android with Kalman filter and accelerometer. Parent comment

Re:Reduce GPS data error on Android with Kalman filter and a... by emj on Wednesday March 21, 2018 @02:58AM (#16636084)
With some hackery you can get an RTKLIB compatible GPS for as low as $30, but one should expect to pay no less than $200-$400 for a ready made solution with an useable antenna. Costs go up fast from there.
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