Errors (or "biases") which are present in the (Broadcast or Precise) Ephemeris data. Broadcast Ephemeris errors are typically at the few metre level, while Precise Ephemeris errors are at the decimeter-level. Ephemeris errors are largely mitigated by differential correction (in DGPS Positioning) or in double-differenced observables (formed from carrier phase measurements) when the receivers are not up to a few tens of kilometres apart. In very high precision applications and/or where the baseline lengths are hundreds or thousands of kilometers, residual Ephemeris Errors may limit the accuracy of the baseline solution.