Quote Originally Posted by vic n View Post
Expect a much improved view, due to the screen size. Did you do the transducer exchange? If not, it may be something to consider. With the 859 you will have the ability to connect to other units, share waypoints, etc.
Though the transducer exchange was only for when you bought a 899si unit and wanted the high def si like the 999 and the 1199 has. Did not know that there was one for a 859ci hd di.