Hi Coreyc,
You can make recordings to the SD card, but the files are raw-data files, not traditional video files (*.AVI, *.MOV, *.MPEG etc.), so they cannot be played back with a media player. To "replay" the data, you can use the sonar itself, or you can copy the recorded files to a PC and view the data with a 3'rd party viewer software. (Each Humminbird "recording" consist of a *.DAT file and a folder with data from each sonar channel.)
You could also use the video-out connector to record what you see on the screen, but you would then not have the option to make adjustments to what you see on the screen during playback.
Tore