I went with the 2 graphs at console on my new rig. I will be using a HDS7 in console and a HDS10 on ram mount. My thinking is to use the 7 for mapping and running the lake. Then use the 10 for DI,SI for the bigger screen and more detail. Alot of my friends boats are setup this way and it works great. Also u have a backup unit incase of emergency.