Thread: Sonar pattern pictures.

Down Imaging & 2d comparison ...



With Side Imaging added ....

FFS is (135° x 20°ish depending on brand)

Forward facing Sonar


FFS in Downview position


FFS in perspective/landscape position


Rickie

following…

One important thing to keep in mind is that the beams aren’t neatly defined areas like the drawing would possibly lead you to believe. The angle given is the 3dB or half power beam of the transducer. The picture of the beam represents the area where signal is 50% or more as strong as the strongest signal. Outside of that area, the signal is lower, but not non-existent. There is no hard line at the edges, and the signal strength is not the same everywhere within the area shown on the beam diagram. You can see this clearly in the formation of fish arches on 2D sonar. The arch shape is the result of geometry as the transducer gets closer to and moves away from the fish. The arch being thicker in the middle and tapering is the result of the fish being out near the edge of the beam, moving into the center, then back to the edge.

Originally Posted by CatFan

One important thing to keep in mind is that the beams aren’t neatly defined areas like the drawing would possibly lead you to believe. The angle given is the 3dB or half power beam of the transducer. The picture of the beam represents the area where signal is 50% or more as strong as the strongest signal. Outside of that area, the signal is lower, but not non-existent. There is no hard line at the edges, and the signal strength is not the same everywhere within the area shown on the beam diagram. You can see this clearly in the formation of fish arches on 2D sonar. The arch shape is the result of geometry as the transducer gets closer to and moves away from the fish. The arch being thicker in the middle and tapering is the result of the fish being out near the edge of the beam, moving into the center, then back to the edge.

I know I’m an amateur at this livescope thing, but it appears to me that the perspective mode is the best to use!


Sent from my iPhone using Crappie.com

Originally Posted by icehouse

I know I’m an amateur at this livescope thing, but it appears to me that the perspective mode is the best to use!


Sent from my iPhone using Crappie.com

For close in targets and shallow water, that may be the case. Two factors I can think of make it very helpful : it does provide a wider swath of coverage ... and ... the boat icon that shows the direction the transducer is facing.

The wider swath coverage is self explanatory. The boat icon showing tdx direction allows one to know in which direction the tdx is facing without having to look at the trolling motor directional arrow (if there even is one). Would also help at night in cases where trolling motor arrow is not lighted.