Unfortunate as it is, modern equipments lifetime is 20-25 years if you are lucky.
I got the same problem with my Navman. No person wants to touch it.
I think we both are up for an expensive replacement.
What is even more ludicrous in my case, the people who made it 25 years ago, rubbish it the most trying to induce me to buy their new products at the last boat show.

