Animation of observed trajectories using spline-based interpolation (see for example, Buderman, F. E., Hooten, M. B., Ivan, J. S. and Shenk, T. M. (2016),
Now able to specify single network color through 'network.colors' argument. Other functionality not yet added.
New argument 'bg.misc' allows for extra flexibilty in background images by inserting code snippets between background generation and locations/network connections.
Now able to specify color for date text ('date.col')
Error lets users know they now need to register with Google to use map tiles, and shows how to use ggmap::register_google() to input their key.