Quote Originally Posted by OrangeAgent View Post
I have had an 897 2d, 597 di, 859 di, and helix 9 and the 2d is much easier to read and more clear on my helix. I dont know what to attribute this to as far as hardware but the returns are much more distinct and with less clutter. And not just from a larger screen the same goes for watching 2d in the triple view. Sometimes i wonder if the transom di ducer i have on my trolling motor is worn out but i really cant say.
The 2d sonar beams on di units are 200/455 khz with 20/16 degree cones. A regular 2d sonar is 83/200 khz and 60/20 degree cones so you see much more of the bottom. DI in the bow only shows what is now under the boat...if you want to see what's coming and what's under a spider rig right now then regular sonar will be better. The cone on DI units using 2d sonar is likely less than 3 feet at 10 ft of depth while on a 2d unit it would be 10 feet.