Originally Posted by FF
What ID numbers will be required from the dome to know if its workable for you?
The model that I have (the one that just died) is M92650-S so that model of the 24" cousin M92652-S. According to Raymarine's FAQs the 18" dome with S/N 0530158 and up or the 24" dome with the S/N 0530247 are compatible with the C120 classic chart plotter. According to the manual for the RD218 and RD424 (newer model but not HD) they are also compatible.