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Type
Different finder types are best suited to different types of boat, so when choosing a fishfinder you should start by deciding the type of device that you want. For example, standalone fishfinders are generally aimed at owners of smaller boats who just want to see if there are any fish directly below them. Alternatively, serious or commercial anglers could use a combination fishfinder and chart plotter. These devices scan over a wide area and help you to plot a course to where the greatest concentration of fish is located.
Display
It's important to make sure that your fishfinder has a display that suits your needs. Finder displays come in many different specifications, with some offering high-definition output. In addition to screen resolution, you should also take display size and contrast into account, as you will need to ensure that the screen is easily readable while outdoors. A higher display specification generally increases a fishfinder's cost, however.
Power
A fishfinder's power is the strength with which it sends out sonar pulses. Greater power increases a finder's range and allows you to measure more accurately in poor conditions. However, more powerful finders tend to be more expensive, and a large amount of power is not always needed. If you only ever fish in calm lakes you can usually get away with a power rating of around 200 watts. Bluewater anglers, on the other hand, may need power of 1000 watts or more to get accurate results.
Frequency
Fishfinder frequency represents something of a trade-off. Finders that broadcast signals on higher frequencies are able to detect smaller fish, as high frequencies make for shorter wavelengths. However, lower frequencies are more penetrative, allowing you to see further down into the water. As with power, the frequency you need will likely be determined by the type of fishing you do. If you fish in shallow waters for small fish, use a high-frequency finder. If you regularly fish deep waters, use one that transmits on a lower frequency.