Hey there I am looking at creating an adventure race in a local area. But would like an app build which would allow contestants to access a video of instructions once they come within 15m or so of a GPS destination. I would also like their GPS to work like a compass and point them to the next destination. So basically directing them where to go (even a distance meter would be great, counting down how far they have to travel) once they arrive at their destination they can access information and a video or something? can anyone help?