When investigating a ScanFish issue, EIVA support will usually ask for the Flight log files.

By default they are stored on the topside PC in:

C:\temp\ScanFish\Log

Zip this folder (or the relevant log files for the time of the problem) and attach it to your support ticket, together with the date and time the issue occurred and the cable length / operating depth.

If the log or ZIP folder is bigger then 20MB, ask Support to provide you a link to a folder for uploading the logs.