Sounders

hi everyone. Just doing a bit of science study and noticed something that makes a lot of sense. I have realized sounders use sound waves to shoot to the closest object underwater, traveling at 1500m per second and when the sound hits the object it goes back up to the boat, which does the equations which tells you how far away the objects are. I found this interesting, so I was wondering how does it recognize there is a school there? How does the sounder realize that it is not the bottom?

 

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Fishing the swan for bream, it's just an obsession


sandbar's picture

Posts: 704

Date Joined: 25/10/09

Density

Fri, 2015-05-29 18:00

The density of the fish and bottom of ocean feed back a different signal. Some schools of fish are so thick and solid that you receive a false bottom image where the sonar reads the school as the bottom.

It gets better too the more you look into it

Posts: 1522

Date Joined: 09/03/13

basically it come up to user

Sat, 2015-05-30 08:51

basically it come up to user interpretation ...what you see on the sounder screen with the settings you have input.

Posts: 5981

Date Joined: 17/06/10

Sounders how they work

Sat, 2015-05-30 21:05

If you are still at school, take a real big interest in physics and how sound propagation works in water.
Get a solid education and understanding of the rules of how sound travels and you will have a very good solid understanding of sounders.

scotty70's picture

Posts: 40

Date Joined: 29/05/15

hi all cannot find one thing

Sat, 2015-05-30 22:52

hi all

cannot find one thing on an eagle cuda 360 sonar/sounder???

I know its an old model as came with boat but having major trouble reading it;...any help as too least find a manual???

bushbeaver's picture

Posts: 159

Date Joined: 08/07/13

https://www.youtube.com/watch

Sun, 2015-05-31 05:17
sandbar's picture

Posts: 704

Date Joined: 25/10/09

Farkin Easy

Sun, 2015-05-31 21:13

How To Read Your Echo Sounder, A book by John Adams. Has
been plugged heaps since it came out. No matter what sounder you have buy this book and read it!