OEMParser loads NaN accelerations into PVCoordinates creating propagation problems
The updated OEMParser will fill in Vector.NaN if there is no acceleration data. When being evaluated in event handlers the getPVCoordinates return NaN values. If there is no acceleration then it shouldn't be constructed wiht any.
(from redmine: issue id 262, created on 2017-01-17, closed on 2017-07-27)