C90W SeaTalk

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum GBay360,

The port of a C-Series Widescreen MFD is not only responsible for supplying power to the MFD, but it is also responsible for SeaTalk communications. Assuming that no cabling changes occurred when swapping the MFDs, then it would appear that there is a fault within the replacement C-Series Widescreen MFD's SeaTalkng communications circuitry. Before assuming such, it is recommended that it be determined whether the other SeaTalk devices are communicating with one another.