The HBSI converter is a utility provided by RGecy and not from yellowFin so dont call them. Now for your issue check this link in the forum:
http://forums.sideimagingsoft.com/index.php?topic=937.0This will explain the files created in a recording. Each of these must be there in order for viewers to work.
After you copy over to the PC check the files to ensure tat all are there..
You might also try the humviewer as a viewing program. it was written especially for HB recordings by Martin. he has a web site to support. Check in the downloads.
You csn email me directly also. Or call 252-430-7731 anytime.
You are so correct that sonar improves object finding and provides a higher level of safety for divers.
Chuck