My colleague is selling the following kit which he has had to replace as the radar unit got salt in it! Rather than have it repaired he was offered a brand new similar unit which was an upgrade and had to remove all that is being offered
Raymarine RL70C Chart Colour Plotter & Cartridge
May be a good price for someone needing similar.
Raymarine RL70C Chart Colour Plotter & Cartridge +18" Radar in need of repair | eBay