17 Attachment(s)
The Big Sonar Quiz Thread
This thread is a collection of sonar interpretation "quizzes" that have been posted on Crappie.com by our members. Some are specific questions, and some are more thought provoking general questions. What they share is that all of them are an opportunity to gain insight into understanding what is showing on your display. They cover standard 2D sonar as well as side and down scan sonar.
After looking at each question, click on the link at the bottom of the section to go to the original thread where the discussion about the image happens. Feel free to post your own questions or comments on the threads, even the old ones. We operate on the idea that the only stupid question is the one you don't ask. Don't worry if the discussion is way over your head. Somebody will help you get up to speed.
We'd also like to see new questions asked. If you know of a discussion, yours or someone else's, that merits being included, let me know.
Sonar Quiz#1 Courtesy of rnvinc
This is the only snapshot shooting under a dock that I have...
The square looking "floating" object is the end of the floating walkway between the boat slips...
Attachment 272459
Someone tell me how far I was to the side of the floating walkway when I snapped the screenshot in the above pic....
And what clue(s) led you to that deduction....??
Rickie
Discussion and answers in the thread at http://www.crappie.com/crappie/fishi...s/#post2631438
Sonar Quiz#2 Courtesy of rnvinc (includes Sonar Quiz#3 in the discussion)
What is it...?? (Hint...there's several of these in KY Lake)...
Attachment 272456
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-2-a/
Sonar Quiz#4 Courtesy of rnvinc
Structure or fish....why...??
Attachment 272460
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-4-a/
Sonar Quiz#5 Courtesy of rnvinc
List the things you see and their approximate area in the image...
Attachment 272463
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-5-a/
Sonar Quiz#6 Courtesy of rnvinc
Below are 2 screenshots....
One is considerably darker than the other...(referring the SI only)...
List the reasons that can create these differences in SI images...(and explain each reason separately)...
Attachment 272470
Attachment 272468
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-6-a/
Sonar Quiz#7 Courtesy of rnvinc
We discussed this screenshot in comparison to another SI image in Quiz #6...
Now let's examine this screenshot by itself...
Attachment 272529
The right SI is considerably brighter than the left SI...
List the reasons that can cause this difference in the same SI image...and explain each reason separately...
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-7-a/
Sonar Quiz#8 Courtesy of rnvinc
Below are 3 screenshots of the very same brushpile...(I froze the screen scroll and captured all 3 screenshots 1 after the other)..
Each screenshot shows the cursor position in a different spot on the display...
Which cursor position would make the most accurate waypoint in relation to the actual brush pile...??
And explain why...
----------------------------------------------
----------------------------------------------
Screenshot 1...:
Attachment 272531
Screenshot 2...:
Attachment 272532
Screenshot 3...:
Attachment 272533
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-8-a/
Sonar Quiz#9 Courtesy of rnvinc
What is the meaning of each of the data boxes across the top of the image capture below...??
(Sorry guys...this one is kind of HB specific)...
Attachment 272693
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...onar-quiz-9-a/
Sonar Quiz#10 Courtesy of rnvinc
So we learned the last 2 data boxes are for location (lat, lon) of the "Active Cursor Postion"...in relation to where the boat is currently....
List some uses for the information given in the 1st two data boxes when the cursor is activated during your normal fishing day...?? (Not specifically for this image but just anytime during your fishing day)...
Attachment 272860
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-10-a/
Sonar Quiz#11 Courtesy of rnvinc
Sonar quizzes #9 and #10 dealt with the data boxes displayed when the cursor was activated while viewing a 2d image....
What is the meaning of the data boxes being displayed at the top of the SI image below...??
Attachment 273018
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-11-a/
Sonar Quiz#12 Courtesy of rnvinc
Most tone burst sonar units today come with dual frequency sonar capabilities...
The most common are ...:
*83kHz/200kHz for 2d sonar...
*455kHz/800kHz for imaging...
Looking at the wave length depiction below...
Which wave length frequency (high or low)...will give the most detailed display image...??
Why...??
Attachment 273023
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-12-a/
Sonar Quiz#13 Courtesy of rnvinc
SONAR is an acronym...
What does it stand for....??
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-13-a/
Sonar Quiz#14 Courtesy of rnvinc
I have a blue outline around a certain feature at the top of the 2d display image below (HB and Lowrance both have it)...
1. What is this feature...??
2. How is the data collected for this feature...??
3. How can this feature be used on the water...??
Attachment 273084
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-14-a/
Sonar Quiz#15 Courtesy of rnvinc
Find the item(s) in the image below that definately indicate the SI xducer is properly adjusted "tail up/tail down"...
Attachment 273091
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-15-a/
Sonar Quiz#16 Courtesy of rnvinc
Explain the significance of the light blue area indicated by the green arrow...
Why did the processor paint this "significant area" in the SI image like this ...??
Attachment 273691
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-16-a/
7 Attachment(s)
The Big Sonar Quiz Thread
Sonar Quiz#17 Courtesy of rnvinc
Piezo elements are designed to purposely incorporate 3 major criteria of the piezo element's characteristics....
1. What criteria determines the "shape" of a piezo element's sonar beam ...??
2. What criteria determines the "size" (beam angle) of a piezo element's sonar beam ...??
3. What criteria determines the "Resonate Frequency(s)" of a piezo element's sonar beam ...??
Rickie
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-17-a/
Sonar Quiz#18 Courtesy of rnvinc
Which way does this xducer need adjusting ...??
What clue(s) in the image gives it away ...??
Attachment 273695
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-18-a/
Sonar Quiz#19 Courtesy of rnvinc
In the previous quiz we learned that the "leading" and "trailing" ends of a full arch (from a properly adjusted xducer) ...are indications that the target (fish) was at a greater "Range" from the xducer than when the target (fish) was in the center of the sonar cone...
In the depiction below...explain why the arch is painted thicker at the "center" than it is painted at the "leading" and "trailing" ends...
Attachment 273707
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-19-a/
Sonar Quiz#20 Courtesy of rnvinc
Many color sonar units these days offer several 2d palettes to choose from...
The colors entailed in each Palette choice mean something more than to just make pretty sonar images...
Here is the HB Original Palette as an example...
What factor(s) dictate which color in the chosen Palette scheme get "painted" on each pixel (or group of pixels)...??
Attachment 274177
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-20-a/
Sonar Quiz#21 Courtesy of rnvinc
Can a 2d skimmer xducer be used mounted backwards ...with the flat end facing forward ...??
What would the image look like ...??
Explain ...
Attachment 274179
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-21-a/
Sonar Quiz#22 Courtesy of rnvinc
What details in the following image give indication of bottom hardness/softness ...??
Explain what is happening to the sound pulse (ping) for that echo data to be "painted" as seen in the image ...
Attachment 274181
Rickie
Discussion and answers can be found in the thread at[/SIZE] http://www.crappie.com/crappie/side-...nar-quiz-22-a/
Sonar Quiz#23 Courtesy of rnvinc
The image below shows a split frequency screen ...(credit to Peter at continuouswave)...
Same sonar history ... 200kHz on the left and 83kHz on the right ...
Explain why the 200kHz doesn't paint the pretty arch like the 83kHz does (in this example of the same echo targets)...
Attachment 274200
Rickie
Discussion and answers can be found in the thread at [/SIZE]http://www.crappie.com/crappie/side-...nar-quiz-23-a/
Sonar Quiz#24 Courtesy of rnvinc
Here's an interesting shot ...
What is causing the anomaly in the right SI water column ...??
(credit to Spearfish III for the image)
Attachment 274205
Rickie
Discussion and answers can be found in the thread athttp://www.crappie.com/crappie/side-...nar-quiz-24-a/
12 Attachment(s)
The Big Sonar Quiz Thread
Sonar Quiz#25 Courtesy of rnvinc
Attachment 274222
(credit to 91reddog for the image)...
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-25-a/
Sonar Quiz#26 Courtesy of rnvinc
This one is kinda unique ...
Explain the lighter area in between the 2 darker areas ...
Attachment 274272
Credit to Gil at THT for the pic ...
Rickie
Discussion and answers can be found in the thread at[/SIZE] http://www.crappie.com/crappie/side-...nar-quiz-26-a/
Sonar Quiz#27 Courtesy of rnvinc
Another sonar history lesson ...
Why are piezos sometimes labeled "crystals" or "crystal elements" ...??
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-27-a/
Sonar Quiz#28 Courtesy of rnvinc
Attachment 274377
What else can also be seen in this image ...??
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-28-a/
Sonar Quiz#29 Courtesy of rnvinc
Image credit to kosmo ...
Attachment 274379
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-29-a/
Sonar Quiz#30 Courtesy of rnvinc
Attachment 274381
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-30-a/
Sonar Quiz#31 Courtesy of rnvinc
Attachment 274503
What other tools could we use to learn more about the echo return in the blue ...??
Rickie
pic credit to doc
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-31-a/
Sonar Quiz#32 Courtesy of rnvinc
What are we seeing in this image ...??
What characteristics lead us to the conclusion ...??
Attachment 274506
pic credit to LunkerHunter5006
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-down-imaging/314844-sonar-quiz-32-a/
Sonar Quiz#33 Courtesy of rnvinc
What's wrong with this image ...??
Attachment 274509
pic credit to Kingpoint
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-down-imaging/314845-sonar-quiz-33-a/
Sonar Quiz#34 Courtesy of rnvinc
Chart Orientation ...
*North Up ...
*Heading Up ...
*Course Up ...
Define each ... With example scenarios that each would benefit from ...
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-34-a/
Sonar Quiz#35 Courtesy of rnvinc
Attachment 275024
pic credit to MonteSS... (Monte be quite now)
Rickie
Discussion and answers can be found in the thread athttp://www.crappie.com/crappie/side-...nar-quiz-35-a/
Sonar Quiz#36 Courtesy of rnvinc
Explain what causes "multi-bottom echoes" ...
Attachment 275026
Why do we never see "multi-bottom echoes" in SI ... ??
Attachment 275027
pic credits to Wayne and Doug
Rickie
Discussion and answers can be found in the thread athttp://www.crappie.com/crappie/side-...nar-quiz-36-a/
Sonar Quiz#37 Courtesy of rnvinc
Attachment 275031
pic credit to Swampseed ... Be quite Scott - you already know the answer) ...
Rickie
Discussion and answers can be found in the thread athttp://www.crappie.com/crappie/side-down-imaging/315783-sonar-quiz-37-a/
12 Attachment(s)
The Big Sonar Quiz Thread
Sonar Quiz#38 Courtesy of rnvinc
Can a DI xducer be used mounted backward ... ??
What would the image look like ...??
Explain ...
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HB XNT 9 DI T ...:
Attachment 275036
Lowrance HDI ...:
Attachment 275037
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-38-a/
Sonar Quiz#39 Courtesy of rnvinc
So what exactly is COG ..??
How is COG actually obtained by the unit ...??
And when can it benefit you on the water ... ??
Attachment 275041
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-down-imaging/319687-sonar-quiz-39-a
Sonar Quiz#40 Courtesy of rnvinc
Attachment 275044
What other clues in the image lend to that explaination ... ??
pic credit to crowsie14
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-down-imaging/326492-sonar-quiz-40-a
Sonar Quiz#41 Courtesy of rnvinc
Attachment 275046
pic credit to Bass newb
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-41-a/
Sonar Quiz#42 Courtesy of rnvinc
Explain what causes the wide horizontal color band at the top of the 2d pane ... ??
Attachment 275054
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-42-a/
Sonar Quiz#43 Courtesy of rnvinc
Note ...: This is ONIX which has separate transmitters for each technology (2d/DI/SI) ...
Attachment 275062
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-43-a/
Sonar Quiz#44 Courtesy of rnvinc
Gene asked which slabs were which ...so I decided to make that idea a quiz in itself ...
I've labeled the concrete anchoring slabs in the 3 views (excluding the double echoes of the slabs) ...
Put the numbers together that represent the same slabs in each of the respective 3 views ...
Attachment 275071
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-down-imaging/337188-sonar-quiz-44-a
Sonar Quiz#45 Courtesy of rnvinc
In the SI view below ...:
#2 is obviously closer to the boat than #3 ...
So explain why would #3 give a better return than #2 if #3 is farther away ...??
Attachment 275073
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-45-a/
Sonar Quiz#46 Courtesy of rnvinc
Attachment 275078
(pic credit to kosmo)
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-46-a/
Sonar Quiz#47 Courtesy of rnvinc
Attachment 275080
(pic credit to Gnute)
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-47-a/
Sonar Quiz#200 Courtesy of genec
http://www.crappie.com/crappie/attac...quiz-image-jpg
What is that bright spot under the fish,showing as on bottom?
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...3-little-quiz/
Sonar Quiz#48 Courtesy of rnvinc
List some things that can be done to make structure like this look bigger on the display (especially beneficial for small screen users) ...
Attachment 275082
pic credit to LeeLyons...
Rickie
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-48-a/
Sonar Quiz#49 Courtesy of rnvinc
This pallet bed doesn't look right ...
Explain what is wrong with it ...??
http://www.crappie.com/crappie/attac...df0d5d95de-jpg
Discussion and answers can be found in the thread at http://www.crappie.com/crappie/side-...nar-quiz-49-a/
3 Attachment(s)
The Big Sonar Quiz Thread
Sonar Quiz#51 Courtesy of rnvinc
Once we realize the possibility that there may be Sonar scenarios outside the manufacturer's "recommended" xducer mounting concept ..............
It opens interesting ideas of gathering Sonar information from areas in the water column not normally seen with these manufacturer's "recommended" xducer mountings ...
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Gene has sent me pix of an interesting example he employs using a DI xducer as "side-looking" ...
Here is Gene's target ...:
Attachment 312827
He knows there's fish under there ... but where??
Sure ... SI can be used ... but what about DI "looking sideways" ...??
Gene has rotated his DI xducer sideways to look under docks ... with 3 important criteria to mentally visualize what the targets (rendered into the DI image) actually mean...
1. Mentally visualizing the shape of the DI beam ...
Attachment 312828
2. Mentally visualizing where that DI beam is "aiming" ...
3. A DI displayed image renders "distance to target" from the top of the DI displayed image to the target displayed farther down in the DI displayed image ...
-----
Can you explain what the targets in the DI image below are showing us with Gene's unorthodox "side-looking" DI xducer Setup ...??
Attachment 312829
Rickie
Discussion and answers can be found in the thread at
https://www.crappie.com/crappie/side...nar-quiz-51-a/
