05-21-2024, 02:09 AM
(05-21-2024, 01:14 AM)BearLakeFishGuy Wrote: Those diagonal lines are mostly caused by the transducer not being perpendicular to the bottom. (There is a slight chance it could be fish ascending/descending in the water column quickly though). I've seen this many times on some hyrdoacoustic returns from survey-grade sonar (price about $50K) and once the transducer is adjusted, it will turn the fish into purdy little arches. Also, make sure the transducer is not only orientated to 90 degrees to the bottom/fish, but also orientated towards the direction you are traveling. If you have anything but an ice fishing style transducer (think: upside down ice cream cone in shape), this could also cause the arches to turn into "slash marks".
I agree that those are fish, but you are not moving quick enough to create the arc. The arc is caused when the fish is passing under the boat. I have seen kokanees fly under the boat making lines going straight up and also straight down when the fish is diving to avoid the boat.
If you change the settings to show the fish image. You will better under stand your picture the way you are using it. Try that and see.