The depth scale on the right of the screen enables you to identify the depth of any features you find.To get an accurate picture of the bottom contour, make sure you are trolling or reeling in your fish finder at a slow, steady speed. If your fish finder is stationary, the bottom will appear flat but it might not be. Your sonar will scan constantly, which means your sonar display keeps scrolling even if the sonar isn’t moving.So let’s take a look at reading your fish finder display for underwater features.īefore we do this, just remember two things: Sometimes this information will be more valuable to you than actually marking fish. Either way, it’s a good illustration of the fact that a long fish arch does not necessarily mean it’s a big fish.įish finders are ideal tools for reading depth, seeing the bottom contour and finding underwater features. This may be because the sonar is stationary or moving very slowly, or because the fish are only moving slowly. This return is from a school of bait fish. That’s because a slow moving object will leave a longer mark than a fast moving one, whatever their size. Which one will make the longer fish arch on your screen? The answer is the small one. The big fish swims very quickly through the sonar beam, the small one swims slowly. Now let’s imagine another scenario – again your sonar is stationary, but this time 2 fishes swim through your sonar beam, one big and one small. It means there is a stationary fish under your fish finder, and it might be a very small one. That doesn’t mean there’s a blue whale stranded in the pond you’re fishing. If there is a fish underneath that is also stationary, what will you see on your fish finder display? You will see one continuous line. For example, imagine you keep your fish finder stationary in the water (in other words you are not reeling or trolling it). On your sonar display, you should think of length as representing time. The most common mistake anglers make when reading their fish finder is thinking that a long arch means a big fish. Plus there’s the added bonus or learning and refining a new skill. It’s time to take the plunge and switch off fish icons – you’ll be rewarded with more accurate readings of where the fish are. So for the best accuracy using your fish finder, you need to learn to interpret the data yourself. What’s more, some underwater objects or vegetation may sometimes give readings similar to that of a fish. This means there is not one uniform reading they always give. Unfortunately, even the most advanced units aren’t 100% accurate in interpreting correctly.įish swim at different speeds, in different directions through the sonar cone your fish finder sends. In the case of Deeper sonars, we use an advanced algorithm in the Fish Deeper App to interpret the data. It does this based on factors like the size of the object and the strength of the sonar return. The screen is constantly scrolling – this doesn’t mean your sonar is moving.įish icons are a useful tool when you are getting started with a sonar device: your fish finder interprets the sonar data it receives and tries to work out if it is a fish or not. Know if you’re scanning with a wide or narrow beam. So just remember these 3 points when you’re looking at your sonar display: 1. The current scanning data will be on the right – the further left on the screen, the older the data. The Deeper PRO+ 2 has a wide, medium and narrow beam scanning (47°, 20°, 7°), the PRO+ and PRO have wide and narrow beam scanning (55° and 15°), the Deeper START has a medium/wide beam (40°).One other point to remember about how you sonar works is that it is constantly sending and receiving data, which means your display will be continually scrolling. So make sure you’re aware of whether your fish finder is using a wide or narrow cone when you’re looking at the data on your screen. A narrow cone will scan between 10° - 20°. A wide beam cone scans between 40° - 60°, meaning you’ll be covering a large area. The size of the area you’re scanning will be affected by the angle of the cone. But for now there are a couple of technical points you need to remember. In this blog we’re focusing on the actual images you see on your screen, so we won’t be getting too technical about how sonars work – but our page on how sonars work will tell you all you need to know.
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