The sonar itself is helpful in locating, bait, structure temperature breaks, and fish. In Alaska having a radar is basically required and having autopilot integrated makes trolling offshore possible without a deckhand. Having good electronics is really helpful when you are on a boat for 12+ hours a day. As a charter captain, I like to have the state of the art electronics. What is the best fish finder really depends on the type of fishing being done and the other technology like radar and autopilots that needs to be compatible with the unit. A lower frequency signal around 50 Khz signal has a more narrow beam and works well at finding fish and structure below 100-200 feet. Typically there was a high-frequency band around 200 kHz with a wide beam that was good at finding fish in less than 100-200 feet of water.
Relatively new CHIRP Technology allows for a range of frequencies to be swept simultaneously to allow for accurate feedback at both shallow and deep depths. The clarity of a sonar depends both on the power of the transducer and the frequency in which it is used. Almost all users want a quality navigation display and a detailed sonar display with their fish finder. When we say fish finder today we usually mean sonar, map navigation with depth contours, radar, side scan, 3D-images, and autopilot.
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