I would like to know if when interneting a 858c HD to a 899ci HD SI will I be able to see on the 858c HD screen what the 899 is showing on it's screen? Will the SI and DI of the 899 show up on the 858's screen. What will interneting the two do? Will they share or just share the GPS waypoints? What I may be asking is will or can the 858's screen just become a extra screen for what I would be seeing on the 899 at the time it is shared? Thanks in advance for any answers to these questions.