Side image distance measurements

My sentiments for sure. Buy fresh miners and keep them lively. Turn the graph off cast miner toward structure.Fish On!!!!!!

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Originally Posted by rnvinc

Let’s start by acknowledging that calculating distance to any target in the SI image is not simply “subtract water depth from the SI range to get distance to target�...

It is physically and scientifically impossible for any Sonar beam (sound traveling in water) to travel to point A and then change directions to get to point B (as in the common misconception of measuring from the xducer to the lake bottom and then measuring out from that point) ...

Horizontal Distance to any target in the SI image is a �slant range CALCULATION using the Pythagorean Theory� ...

Using the OP scenario of 10’ water depth and seeing a target in the SI image 25’ away from the SI image center line ...:
Attachment 362855

Next we will delve into the HB software engineer’s minds to explain why the HB software engineers designed the SI image layout as they did ...

But 1st I will give space for questions ...

Rickie

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Yes the boat travels the black centerline of pic on si.

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Originally Posted by RustyJig

So.....if the bottom image ( directly under the boat) is shifted out so that it displays to the rh or lh side of the water column (black area) the side image measurements at the top of the display are off by the depth of the water?

Would the cursor measurement be the same as the top scale?

I noticed from some videos that the side image measurement scale at the top of the display does not change as the boat moves through various depths.






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Mark fish as a waypoint, move to it, and fish . :twocents

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Originally Posted by sharphook

come. Agree mind control salesmanship.

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Not a sales pitch on my part, I have no stake in the electronics market. It can be done with the same unit, as far as I know all Side Imaging units are capable of 2D and DI. I run mine on split screen the majority of the time.

So we’re better off turning the water column off?


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Originally Posted by RustyJig

I was watching a fellow on YouTube, who seemed very knowable, give a class on side image distance measurements and how to determine where a brush pile, stump, etc. is from your boat and he demonstrated it by placing his boat in a parking lot and towing a cooler out to the side and behind his trailer. He proceeded to show how the fish finder displayed this objects distance from the transducer. Everything was clear to my understanding until he said that if the object showed 25 ft to the side of the boat and that you were in 10 ft of water then the object is physically only 15 ft to the side of the boat. He said the transducer shoots a beam to the bottom and then to the side and you must deduct the depth from the displayed distance displayed.

This would have to be taken into account if you threw a marker bouy for instance. But, he said if you use the “mark” button on the fish finder it would mark the correct spot.

Is that correct?


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After reading all of this I have decided that I’m too dumb to use electronics.


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Originally Posted by roachjwr

After reading all of this I have decided that I’m too dumb to use electronics.


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May have to go back to cane pole, Cork and minnow


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Originally Posted by tcounty

So we’re better off turning the water column Offk

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Removing the water column with HB Contour Mode does actually give a better linear representation of the bottom detail without being compressed ...

The disadvantage is losing the details in the water column that one may want to see ...

Rickie

rnvinc , If we are in 30 ft,deep of water
(or less )and set the side image to 40 yds . we would never be off more than a jig pole length(approximately 12 ft ) would we ?

Attachment 363110

Deeper water will exacerbate the difference in the horizontal distance vs slant range distance ...

Rickie