 These data may be stored pending recovery of the device or relayed to a central data store or internet-connected computer using an embedded cellular (GPRS), radio, or satellite modem.The animal's location can then be plotted against a map or chart in near real-time or, when analysing the track later, using a GIS package or custom software.While GPS tracking devices may also be attached to domestic animals such as pets, pedigree livestock and working dogs, and similar systems are used in fleet management of vehicles, wildlife tracking can place additional constraints on size and weight and may not allow for post-deployment recharging or replacement of batteries or correction of attachment.