Do I have a fish finder?

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Technical Forum Jim,

In order to utilize the fishfinder features of a C-Series Classic MFD, one of the following must be interfaced to the MFDs DSM port:
- retired DSM300 w/compatible fishfinder transducer
- retired DSM30 w/compatible fishfinder transducer
- retired DSM250 w/compatible fishfinder transducer

In order for an instrument depth sounder (i.e. ST60 Tridata) or DSM to report depth, the vessel most be located in the water and the water's depth below the depth or fishfinder transducer must be at least 3'. The C-Series Classic MFD is not designed to supply power to a DSM or SeaTalk bus (which in turn would supply power to ST60 Tridata). Troubleshooting would begin by testing the system again after ensuring that all of the vessel's power circuits and marine electronics as well as a through examination of the vessel to determine whether a DSM has been interfaced to the MFD's DSM socket.