Humminbird PC and Autochart (don't know about the Pro version of that program) are not for viewing your recordings. Humminbird PC is for waypoints and Autochart is for mapping. You can input the recordings to gather the depths but I haven't seen where you can actually play them back and examine them. I use AC, but not the Pro version.
Humviewer is for playing back the recordings and looking for details but I don't think it is a Humminbird product. I think it works pretty well.
Yes, I was talking to myself; sometimes even I have to ask for expert advice.