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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...
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)...
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...??
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...
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)...
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...
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...
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Screenshot 1...:
Screenshot 2...:
Screenshot 3...:
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)...
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)...
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...??
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...??
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...??
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"...
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 ...??
Discussion and answers in the thread at http://www.crappie.com/crappie/side-...nar-quiz-16-a/
