Final Year Project

i am currently doing my final year project. The project is about tricycle which moves in some predefined track that is why i am using APM. i just want to know is there any way to stop the vehicle at any waypoint according to your interest at any point in automode by using a phone.
kindly reply me.

I don’t think their is. Once in automode, the vehicle should continue moving until mission is complete.
You can consider planning multiple missions, get it to a point you want it to go then restart another mission.
Best of luck.