Looking at this image from Humminbird’s Facebook page, we can see several things. This technology works best from the front deck of the boat moving slowly, as it takes time for the transducer to complete a 360-degree scan of the bottom. Humminbird 360 and other similar technologies allow anglers to see what is within a certain radius of the transducer. You can see this in what looks like two stumps between the red circle and the closest boat the bottom one being far taller than the other based solely on the length of their shadows. These “shadows” can give you a rough idea of how far cover sticks up off the bottom as well. This shadow effect can help you determine how high off the bottom the fish are sitting, based on the distance between the fish and the shadow. You can tell this because they have what looks like a shadow off to the left of them. There are a few in this red circle however that are sitting a few feet above bottom, and thus easier to spot. ![]() There look to be small fish of some sort scattered all over this reading, but they are hanging tight to the bottom. Fish will appear as little bright specs on StructureScan. Looking at the red circle, you can see what fish look like. You can clearly see four slats on the pallet. Look to the right in the blue circle, and you can make out what looks to be a pallet sunken in the middle of a pile of manmade cover. There’s quite a bit of structure on the bottom here. ![]() Looking around on the bottom, you can easily see the angler recently passed over a couple of sunken boats, one about 5 meters to the left of his boat, the other closer to 8 judging by the scale at the bottom of the screen. You can look at the scale along the bottom and see that is the case based on where the the darker section (water) meets the bottom (indicated by the amber color). The boat is in 3.9 meters of water and has been at roughly the same depth throughout the course of this whole image. ![]() Look again at the scale along the bottom, and then look at the numbers in the top left of the screen. So you are really looking out to the side about 46 feet (60 feet – 14 feet). This also means that you are really only looking out to the side the marked distance (60 feet) minus the depth (4 1/2 meters or approximately 13-14 feet). The water directly beneath the boat is indicated by the darker section of the readout that is directly to the left and right of the boat’s path (line down the middle of the screen). So there’s a total of about 120 feet of the fishery’s bottom being scanned. The numbers along the bottom indicate to us that the user had his graph set to read in meters, so 20 meters (roughly 60 feet) to the left and 20 meters (roughly 60 feet) to the right of the boat. Using the depth scale to the right of the screen to gauge the depth, there appear to be 8 or 9 fish in this treetop, from about 15 feet to 22, with a few of them sitting so closely together that their marks overlap. The yellow blobs in the trees likely indicate bass or crappie, and they are easier to see in the first tree that was passed over- the one to the left of the screen. It appears in this shot as though the angler has passed fairly straight overtop two consecutive trees, one in roughly 25 feet and then another shortly after in 17 feet or so. The yellow indicates a more solid return, the red a little less so and the blue hues indicate a weak return. For instance, in this example you can see yellows, reds and blues. Then there will be different colors based on the density of the object, or how directly the sonar passed over the object. The water will be indicated by one color, often times white as you see here. There will be some sort of color palette with whatever 2D sonar you decide to use. This is a great way to find fish, contour breaks, brushpiles, boulders and more. ![]() If you idle over fish, schools of baitfish or structure, you’ll see them appear on the right of the screen and trail off to the left as you continue to idle. This technology is very useful while fishing from the front deck as well as while idling. And in the oscilloscope mode, you see live real time returns in a sliver on the right. Generally speaking, historical information is to the far left while the most recent history is shown to the right. These transducers shoot a tight cone relatively straight down, giving the angler a good idea of what is directly beneath the boat. One of the more basic versions of sonar available today is traditional 2D sonar.
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