Meade's Autostar has had this for over 2 decades: Autostar Tours, with custom objects by name, R.A. and dec. Celestron's NexRemote has had this for over 2 decades, through NexTour. EQTour, via EQMOD has had this, for a long loooong time. Without the possibility to upload user objects for custom tours, this app + paid accessory, regrettably, is just a toy.