Software for viewing sonar log files

The electronics on my boat consists of a HDS 7 on the Council, LCX-38hd on the bow and structure scan. It is now very useful to log the sonar files from the HDS 7 for replay on my PC at home using the lowrance SLV software. Unfortunately, it is very limited in functionality especially the lack of setting and saving waypoints. Is there any third-party software that would allow me to replay the log files on a split screen with one half showing the log output and the other half showing the trail on a map? While this can be done on the unit itself it's limited to the small screen and original speed. In addition to the larger screen on a PC version it would also be nice to have some speed control. I am aware of the Dr Depth software, but I don't believe you can add a background map.