While I can get my hands on one of the earlier 'not for outdoor use' revisions, I have a feeling you're probably looking for the IP67 version for out in the cockpit. Let me know where it's going and we'll go from there.
The unit is an outdoor hauling station on an offshore lobster. The system is at least 20 years old,a follow-up unit is a must . Because of the age of the system
and availability of parts i will have to upgrade eventually.An easy fix is to replace the steering lever.Simrad has the units available in Tenn.with a core exchange.