Author Topic: Just installed dual transducers on 999si, Help interpreting what Im seeing  (Read 1137 times)

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Offline trogersIII

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Out on the lake today trying to adjust my new dual transducer setup and found what i think are some good shots. A couple of time i saw these diagonal lines and this weird cloud on DI. Any Ideas what it is? Lake Juilette, GA. Pretty sure the arches are stripers but any speculation is welcome.ila_renderedila_renderedila_renderedila_renderedila_rendered


Offline rnvinc

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Re: Just installed dual transducers on 999si, Help interpreting what Im seeing
« Reply #1 on: December 05, 2016, 09:39:59 PM »
Pic 1 is scattered fish in the water column with a few rising toward the boat as they pass thru the sonar cone ...

Pic 2 is the same as 1 .. but also with possible brush on the lake bottom ...

Pic 3 is the same as 2 .. but with a single brushpile on the lake bottom ...

Pic 4 is scattered fish in water column and definately thermocline at 40ft and deeper ...

(notice in pix 1-4 how the length of the fish arch is affected by the boat speed = slower boat speed allows the fish to stay in the Sonar cone longer to create longer echoes on the display)

Pic 5 is misleading because the 999 SI unit doesn't actually have a DI piezo ... the DI image is created from the data received with the SI piezoes and computer generated to "look like" a DI image ...

So even tho the "mass" looks like it's reaching from the surface to the bottom ... it's actually reaching from the boat's path out to the side (and it's most likely your boat passing thru your own prop wash or another boat's prop wash) ..

It would help you understand this by opening a Combo SI/DI view and purposely drive thru your own prop wash at an angle and see how the prop wash is displayed in SI vs DI ...

Rickie
« Last Edit: December 05, 2016, 09:45:35 PM by rnvinc »

Offline trogersIII

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Re: Just installed dual transducers on 999si, Help interpreting what Im seeing
« Reply #2 on: December 06, 2016, 07:17:49 AM »
The prop was makes a lot of sense now! Thanks for the help! Now I just gotta figure  out how to catch these guys.


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