I totally agree with pappy! SI is a scouting tool and the front chair is for fishing and limited scouting. While up front I fish and don't like spending that time focused on a screen. Idle through an area with SI, mark waypoints on structure you want to fish or get a better look. Then, troll back through using 2D and DI. Plus, that HDSI transducer is over $200 if you knock it off trolling motor. You can run the SI on a RAM mount at the console and rotate it if you want to be able to look from time to time as comparison to what you are seeing up front. An 899 at console and 859 at the front would be all you will ever need to get the most out of your electronics for fishing purposes.