A new version of the Sonar Viewer is now available, version 1.0.31.
This includes a fix for an issue that prevented (very) large files opening on systems running only DirectX 10.1 as well as a change to the layout of the sonar viewer. The sonar viewer is now configured "row first" instead of "column first", so that two channels can be viewed side by side on top of another channel (typically sidescan):
The Sonar Viewer will prompt for update on restart.