Hi @scavdrone, welcome to the forum! 
@murf is correct - only the blue-white pair should be connected by default, like this:
The additional three pairs are for any extra connections you might want to make at some point later, like using a Ping360 with the RS-485 interface option, or a WaterLinked underwater GPS, or anything else that you’d like
As a reference, our Ping360 RS-485 Configuration Guide shows an example set of connections:
