Reading between the lines I take it that you have a Helix model that only has 1 card slot. If this is correct then yes you will have to use a blank card to record and take snapshots. They are several ways to review the recordings. 1 is watching it on the sonar unit itself and another is using Humviewer that can be down loaded to your computer to watch the play backs. They are others also but these two are the ones I have used. Also a ton of this information on youtube. Maybe this will a help to answer some of your questions.
HumViewer - Viewer of Humminbird sonar recording files
https://www.youtube.com/results?sear...+and+play+back


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