The 997 Si Unit has two SD slots so that you can keep the Hot-spots SD chip in while adding a second SD chip to use to take snap shots of what your screen sees. That way you don't have to swap SD chips like you have to do with the 797 SI unit.

I wish that the 797 SI unit had two chips.

That's the main difference between the two units other than the screen size.

But one advantage that the 797 SI has over the larger more expensive 997 SI unit is the vertical pixel count. The less expensive and smaller display is taller and therefore has 640 vertical pixels. Which is great for showing fish and the bottom in 2 d mode.

I want the 997 SI bad but my budget won't allow me to get the 797 SI yet. LOL Whoa is me

Congratulations on the new purchase. I have read so many post like yours from proud new owners of the Humminbird SI series.


Quote Originally Posted by stratos179 View Post
Well I put the 797 in the water today and all I can say is these are unbeliveable I went to a spot I usally fish in the mornings I could tell that it had a rocky bottom by feel but my old unit never showed anything other than a hard bottom well on the 797 I could clearly see several good sized rock piles scattered over the whole area which makes me like that spot even more and the balls of baitfish you see on this thing are as clear as can be I was using the split screen and there were several things you would see on the SI that the regular sonar didnt show all I can say is so far I love it although I have to move my transducer because I lose the bottom as soon as i plane off I went and bought a SD card today so I can take pics with it I dont like having to take my Hot Maps card out to use the SD card I would have thought that the hot maps would load on a hard drive on the unit and you could remove the card either it dont work that way or I'm doing something wrong but other than that I would recomend buying one normally I couldnt afford it but Ive been doing some work on the side thats let me upgrade several (toys) on my boat.