Does anyone have this setup? I am looking at a 858 for my bow unit and linking it with my 997 on my console. I will also get a HDSI ducer for it even though it doesnt do SI/DI, but this way i can switch it out with my 997 if i want that on the bow for slow trolling. any thought? good or bad....thanks...also if you have a 858 you may be interested in selling in the future let me know...i am in no rush to make a purchase