These sonar reflections will also display on the screen. So this way a fishfinder reads and lets you view the bottom and everything it encounters in between. The angle of the sonar beam is measured in degrees and it’s called the cone angle. A wider angle covers more area underwater. Different fish detector models come with different cone angles. Some models also include multi-beam sonar technology that allows covering a much wider area.

Fish finders were derived from fathometers, active sonar instruments used for navigation and safety to determine the depth of water.[1] The fathom is a unit of water depth, from which the instrument gets its name. The fathometer is an echo sounding system for measurement of water depth. A fathometer will display water depth and can make an automatic permanent record of measurements. Since both fathometers and fishfinders work the same way, and use similar frequencies and can detect both the bottom and fish, the instruments have merged.[2]
Just plug it in and fish. Yes, it's that easy. Transducer Type: TripleShot. Fishing -Tackle Box/ Accessory. 2 Autotuning sonar. It doesn't get any easier. The world’s easiest fishfinder, HOOK. Easy front-dash or quick-release bracket mounting installation - Pick the best installation option for your boat from simple flush-mount and quick-release-bracket installation options.
For just around 600 you can get this Raymarine Dragonfly fish finder that offers features that are usually found on much pricier models. It uses next-gen CHIRP technology that gives photo-like imagery with high resolution structure. The CHIRP technology transmits a wide spectrum of frequencies and the result is a much higher resolution. The generous size (5.7 inches) of the display gives an easy read of the underwater details and the 1600 nits gives clear viewing even in bright daylight.
Fishfinders allow anglers to see a graphic representation of what is beneath their boats so they can identify fish. To choose a fishfinder, consider the type of unit—whether it includes GPS and is part of a boatwide network, size of the fishfinder’s footprint, resolution of the display, how much transmitting power you need, and what frequencies will work best in the inland, coastal or deep-water environment where you fish.
If you’ve used a fish finder before, then you might be wondering why it’s necessary to get one with a GPS. To be perfectly honest, if you are someone who likes to fish in your local area and either casts from the shore or the back of a small boat, then GPS capability may not be something that’s worthwhile. However, for any fisherman who likes to go searching for the best catch, having GPS installed on your finder can make a world of difference. Here are some of the best reasons to get the  best GPS combo fish locator.
The sound wave spreads as it gets further from the transducer. The wider the cone, the larger the coverage area, but the as the cone angle spreads, sensitivity diminishes. A 20-degree cone is considered a versatile angle for fishers who frequent different water depths. More advanced devices come with double and triple beams, ideal for scanning deep water depths.

The last model we would like to mention in our top 12 list is a model also from the Humminbird brand. It’s also one of the best inexpensive fish finder models. It comes with a black and white display. The sonar is dual beam and its frequency (200/455 kHz) allows viewing readings of depths of up to 600 feet. It’s also a small fish finder with the display being just 4 inches. The clear edge grayscale display clearly shows everything even in direct sunlight.
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