I am picking up a new terrova ipilot with the link and Gps puck. I have a 3 year old ipilot I’m selling tomm. Mostly want the accuracy of the new ones. So I’m wondering, do I waste money on a  Humminbird router for that and my 3 fish finders or is the new ipilots accurate without it? (Back locater is connect to console, front is a helix 7 ice (non networkable) connected to trolling motor).