Reply With Quoteimonbass's Channel - YouTube according for this guy 60' gives 60' bottom and 60' surface. you don't have to do math..is he teaching wrong for hb??
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thanks good information
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imonbass's Channel - YouTube according for this guy 60' gives 60' bottom and 60' surface. you don't have to do math..is he teaching wrong for hb??
"If people concentrated on the really important things in life, there'd be a shortage of fishing poles." ~Doug Larson
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Maybe Greg will answer this for us....Originally Posted by FalconSmitty
Doug is the HB professional...
I have been wrong before....
Greg can you clarify the SI Range setting before I confuse people...??
Rickie
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Im going with Rickie on this one. But we both could be wrong.
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The Si Range is actually the slant range from the transducer. Think back to your geometry days (or daze for some of us!)… remember this:
Well the Si Range is that side “c”.
Point “B” would be the transducer mounted to the boat.
Side “a” would be the water column (water depth).
Side “b” would be the lake bottom that is shown.
I watched the video that was posted and did not hear Doug contradict this. If I missed something in it, please post back the time stamp for that section.
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Now that Greg has cleared that up for us...I must go back and clarify a statement I made in my own quote above (highlighted in blue)...
My statement (about the SI Range lines) is incorrect....
The SI range lines are inserted onto the SI image in a division of 4 ...of the SI Range setting...
"SI Range setting divided by 4"..= Range lines on the SI image
If the SI Range setting is:
40 ft..the range lines will be 10, 20, 30, 40
60 ft..the range lines will be 15, 30, 45, 60
70 ft..the range lines will be 17, 35, 52, 70
80 ft..the range lines will be 20, 40, 60, 80...etc...
I hope I didn't confuse anyone...
Sometimes I have to actually go work with my unit...instead of trying to remember all this techno stuff...
Rickie
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So Rickie if the unit is set on 50ft. that is 50ft. from the transducer?
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Referring to Greg's post with the geometry triangle...
The SI Range setting is the linear distance (in a straight imaginary line) from the xducer (sloping down and out to the side) to a point on the bottom that is equal to the SI Range setting...
This "slant range" as Greg calls it is basically the Pythagorean Theorum of a "right triangle"...
"a" (squared) + "b" (squared) = "c" (squared)
In this "slant range" formula that HB is using... The deeper the water... The less % of the SI Range setting will be actual bottom coverage....
What does this SI Range setting mean for us HB users...??
1. Set the SI Range setting at a small enough setting so that structure on the SI image is descernable....(the higher the SI Range setting - the smaller structure will appear on the image)....
2. Objects on the SI image are closer to the boat than they appear on the image (because the water column depth is figured in to the SI Range setting's "slant range" formula)...
3. The SI Range setting is "not" the actual bottom coverage...
Rickie
Last edited by rnvinc; 02-29-2012 at 02:19 PM.
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