I went to a Humminbird seminar at the BassPro Classic last weekend. During the presentatation it was suggested that if you have 2 Humminbirds, you should connect them up with the Interlink Network Module. I have a Humminbird 997c SI & a 788c SI and fish about 3 times a week. I always thought that only the guys fishing tournaments use an accessorie like the Interlink.  I'd like to hear what other non tournament fisherman think. And is the Interlink difficult to install?

Not difficult to install at all. It comes with the interlink, cables and mounting hardware. GPS plugs into one port on the interlink and the other two ports are for the fishfinder units.

I've got one and love it. It allows me to drive by a spot with my 997, mark a spot and then drop the trolling motor and go right back to it using my 787 on the bow. It transfers all waypoints and routes saved on each unit to the other. The only thing it won't do is share the map card data from one unit to another.

I just got the Interlink today. Where's the best place to mount it in the boat?

I have mine mounted in my rod locker. 

Thats where I've got mine mounted also, on the right hand side of the boat.