Water, salt, dirt, and corrosion are the worst components for damaging your cable connectors.
Unlike a motor boat where the cable connectors are typically protected from most of the harsh weather conditions kayaks are completely exposed. Were out there taking waves over our bows landing on sandy beaches and constantly getting rained on.
For a small cost you can protect your cable connectors to obtain the maximum lifespan out of these expensive cables.
The solution is simple. Dielectric Grease and Caps that are designed to protect the 
patruding end of a nut and bolt.
The result is a water tight protected Cable plug. To should still be careful takes it from getting sand or other debris. The grease it will stick and make a pretty big mess.
You can find these screw protectors at your local hardware store. They come in different sizes so measure the cable end you would like to protect prior to purchasing them.
I put the dielectric grease on the female plug then place the cap over it. This added protection should prevent corrosion and extend the life of your electronics cables.
