7" with side imaging, 5" if you're just looking for down/2D. I am very happy with my HB Helix 7 Mega SI G3 - I hated my Lowrance Hook Reveal 7. If you get Lowrance, I highly recommend NOT getting any model with the tripleshot/splitshot transducers - they are underpowered. The 3 n 1 ducer and the...