07-04-2017, 12:38 PM
Regardless of make or model, remember that your finder will only show fish that are right below you inside its search "cone" (this refers to the original look-down models, of course.) Any fish not within that narrow cone won't be seen, and lots of fish move aside when your boat passes over them - right out of detection range. The louder your boat, the more likely you scare fish away as you pass over them.
The cone is narrow, especially on dual-beam models when you have the narrow beam selected. Roughly, consider that the area you're looking at is about one third the depth. In 30 feet of water, your cone is only 10 feet wide at the bottom, even less between boat and bottom.
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The cone is narrow, especially on dual-beam models when you have the narrow beam selected. Roughly, consider that the area you're looking at is about one third the depth. In 30 feet of water, your cone is only 10 feet wide at the bottom, even less between boat and bottom.
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