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Old 02-28-2011, 02:07 PM   #1 (permalink)
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Default Which side???

Here is a Humminbird Down Imaging Image. Can you tell which side the trees are on under the boat?



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Old 02-28-2011, 10:57 PM   #2 (permalink)
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Default Re: Which side???

right?
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Old 03-01-2011, 01:35 PM   #3 (permalink)
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Default Re: Which side???

I would say left side as the images seem to go to the bottom of the screen, unless those are the shadows and not the stalks from the grass/stickups??


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Old 03-01-2011, 02:01 PM   #4 (permalink)
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Default Re: Which side???

Think about this hard now.
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Old 03-01-2011, 03:04 PM   #5 (permalink)
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Default Re: Which side???

Straight down?
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Old 03-01-2011, 03:31 PM   #6 (permalink)
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Default Re: Which side???

I'm trying Mike, I just haven't been able to play with the down imaging (only used twice since installing). I am trying to go by memory after looking at some of the other images you and Doug have put up. The last time out was the first time I actually took screen captures, I still need to figure out how to view them on my computer.. Thank you guys for giving us these views to help speed up our learning curve....

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Old 03-01-2011, 03:56 PM   #7 (permalink)
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Default Re: Which side???

All you need is a Photo Viewing Program like Microsoft Paint or I use Microsoft Office Picture Manager to View Screen Captures on the Computer...

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Old 03-01-2011, 04:46 PM   #8 (permalink)
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Default Re: Which side???

Underside was the correct answer....Just like when people ask me where to fish? In the water is the best place I've found. That eliminates 1/3 of the earths surface Side Imaging eliminates alot of the rest

Now back to serious part of this discussion. What I'm trying to teach here is that Down Imaging is like 2D traditional sonar. It covers a specified area and all the data in that area are compiled together in a single view. Now QuadraBeam Sonar and Side Imaging has unique features because they not only tell you whats under boat but also to which side they are. Isn't it easier to make a cast to fish if you know which side they are on?

Here is the Side Imaging of the above image:



Is it easier to tell which side of the transducer you need to be casting to if you wanted to fish.

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Old 03-02-2011, 12:52 AM   #9 (permalink)
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Default Re: Which side???

Good one

It makes sense that it would be under the boat, my question is how do you know the width of the beam. (83/200 khz=depth you are fishing). With down imaging you can choose narrow/med/wide beam. How do you know how big the area is that is being shown. Does it use the 455khz to determine the image for down scan? If the beam was as wide as the depth, then it would be possible for the trees to be to the left/right side of the boat, I understand now that you cannot tell which side just by looking at the 2d/downscan, just wondering about beam width.

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Old 03-02-2011, 09:08 PM   #10 (permalink)
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Default Re: Which side???

Jason,

200khz/20 degree is 1/3 of depth
83khz/60 degree is Depth x 1

So figure 30ft of water
200khz has 10ft of bottom coverage
83khz has 30ft of bottom coverage

Narrow beam is roughly the same as 200khz sonar
Medium Beam is roughly the same as 83khz sonar
Wide Beam I believe is 75 degrees??

So it's possible that you can see something on DI wide beam and not see it using dual beam.

Also figure that DI has the foot print of a straight line unlike sonar which has a circle foot print...

Mike
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