I've got a little package of Raymarine
networking goods. I was using these things to shoot depth
info from my ST40 to the ZeusT7. Pulled these things because I'll be putting the N2K through hull
in later this year.
E22158, ST1 to STNG Coverter
Raymarine A06045, STNG to Devicenet / Micro-C cable
Raymarine D244, St1 3-Way Junction Block
There also looks to be an extra ST1 to ST1 cable.
$100 shipped to the US.