I had a very old autohelm unit that has steered a few boats for me. It once was submerged in saltwater for 2 days. I took it apart, washed it with fresh water, blew it out with compressor and let it dry a few days. Full recovery.
Anyhow, a tiny plastic gear broke on it before my trip so I replaced it with one from a non-working unit. Everything was good until Molokai when another main drive gear split. I managed to glue it back together but it makes a horrible sound now and I fear it will die completely.
For me the autohelm is essential equipment it steers about 90% of the time and does a better job than I would.
So while I was in Honolulu I had to buy a new one for peace of mind. Expensive , but I could just take the bus to West Marine and pick it up.
Here it is installed
If you don’t have some sort of self steering for your boat then you should consider it. Your sailing life will be transformed.