With the name “Raytheon” on it which was the name prior to them being renamed Raymarine and which was then taken over by the firms present American owners “Flir,” the one thing that is against you is the age of the instrument. It is going to be something in the order of twenty years old or more. The chances of being able to get it repaired for sensible money are likely to be few and far between such that in my opinion, and with you being an ex electronics technician, that you might as well open it up and see if you can fix it yourself.
My ex charter boat when I bought it back in 2010 came with a Raymarine RL70 plotter. The plotter had been much abused by those expert yachtsmen who didn’t have a boat of their own, but were more than prepared to charter a boat they knew nothing about, tell the owner how to look after his own boat and at the same time leave the instruments out in the rain and weather to fare for themselves and then complain that the screen was partly misted up with condensation. It too was getting on in years and had been superseded by colour chart plotters and by models with much better displays. When it went wrong I felt that there was nothing to be lost by opening it up myself, and I’m not an electronics person by any stretch of the imagination, though I knew enough at the time to realise that a couple of egg cups full of water sloshing around inside was arguably not the best stuff to have inside the plotter. It did go back to Raymarine, and they worked a miracle and kept it going for a further two years when I gave it away and purchased a new multifunction instrument that is so advanced by comparison.
So I think you might as well have a go yourself and if it still doesn’t work then you have lost nothing.
