Protection of Wiring in Marine Environments

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For additional corrosion protection of your logger and sensor wiring, applying a
petroleum jelly (Vaseline, non-corrosive) to all of the sensor and
logger terminals can be effective.  

Other options include commonly available dielectric grease which is purpose made for preventing corrosion of electrical connections.  The grease is non-conductive (so there is no need to worry about electrical leakage or shorts), is very slippery and available at auto parts stores.

One such example is: http://www.jamestowndistributors.com/userportal/show_product.do?pid=8196