I was wonder if the i-pilot will work with both units at same time? I can pick up a 898 si for the the bow for $700. Do you use the unit at the wheel to set way points and tracks to then tell the i-pilot where to go or can you use both units? Has anyone used SI on the trolling motor? I think you have to be moving for SI to work, so if you have to drive past it then come back at it t fish, do I really need SI at the front? Also the trolling motor rotates which will mess with the image coming to the screen, so is it only used for DI and location on the water? Can I then switch between the two units? Again this will be all new to me, never used either one on the water. Lnk is hard to find any info on other then a few neat features. Thanks