Thread: Can depth finders "read" pvc?

PVC is solid enough to show on the majority of sonars, fish however are not... except for their air bladders. When you mark a fish on sonar, you're not actually marking the fish... you're marking the air bladder! Sonar doesn't work through air and fish flesh isn't dense enough to return a good echo... guess what you're picking up on the sonar when you mark fish?

Originally Posted by GCD

PVC is solid enough to show on the majority of sonars, fish however are not... except for their air bladders. When you mark a fish on sonar, you're not actually marking the fish... you're marking the air bladder! Sonar doesn't work through air and fish flesh isn't dense enough to return a good echo... guess what you're picking up on the sonar when you mark fish?

Sonar does work thru air, but not efficiently with this type transducer. Sonar ranging is common in motion robots.

FYI.

I have sunk a great deal of PVC and I can see them on the H'bird quite well. Actually the hardest thing to see with SI is small limbed brush on a hard bottom. I do not think you can hide anything from traditional sonar.

My theory is most pvc is small diameter and built verticle so you will have less area to bounce signal back. Wooden stakebeds built short with few small,wide spaced stakes doesn't show up as well as horizontal brushpiles.