Hobie Outback thru hull question (when using with Lowrance HDS unit)

[Iceman]

I usually take on the water when the boat is beached/at shore and it rains, or during long haul travel when it is on the trailer and it rains.

had not heard this one before, little extra goop on the back side would remedy. Some cables do not fill the hole snug on the plug, there should be a rubber gasket sealing the base to the hull.