Side view Imaging

[Crankbait]

I have a question for anyone familiar with the hummingbird or lowrance side imaging systems. I was going to purchase one of their lower models….. I think the 798 series…..but it only had one sd card slot. My thinking was I wanted the unit to have two, that way I could run Hot Maps system on one and on the second card take pictures, video clips and store wave points. Is this possible? Also when you mark wave points are they stored on the card…… the one with the blank sd card. So can you label sd cards by lakes? That way whenever you go to the lake you just pop in your sd card for that lake.