Wide Open Winter

[Murray]

Originally Posted by chris138

I have the HDI model, not the DSI. But I believe it still has the ultra high frequency. My understanding is that down scan doesn't perform well in deep water, and especially not in cluttered deep water. I don't ever use DSI, but i don't have the chirp model. That being said I have seen some bitchin returns from my friends chirp with the DS overlay. I think it overlays 455 kHz over 200 kHz and gives a better HF image of bait and small objects. After playing with it and dropping your sibiki a hundred or so times, you should be able to easily distinguish between bait and kelp, or even spanish vs greenies.

I prefer to use a dual screen vs overlay. Dual screen will show conventional sonar and down scan image at the same time.