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Choosing the Right Graph
There are several important factors that go into the purchase of a graph; pixel count, peak to peak power, screen size, etc… the following are critical:
Pixel Count: Basically this is the number of squares that make up the picture you see on the graph. The higher the count the greater the detail. If you plan to fish deep, you will need a graph with a minimum of 320v x 480h pixel count.
Cone Angle: Measured in degrees this will give an idea how wide of an area you are viewing on the bottom. For deep fishing, a minimum of 15 degrees is necessary.
Screen Size: The larger the screen the greater the detail, most deep fisherman use a 7” diagonal screen.
Greyline: This is a Lowrance term. Simply put it shows items of differing densities with differing shades of grey with darker grey being the stronger signal (i.e. a rock bottom is a darker grey than a mud bottom, or a fish laying on the bottom)
Zoom: GOTTA HAVE IT! 2x & 4x zoom allows you to look closer at your bait and the structure the fish are holding to without having to adjust the upper and lower limits of your view.
Transducer Frequency: The higher the frequency the more detail. 200 kHz is used for deep fishing. A 50kHz is used for trolling and deep sea fishing. It has a broader view.
Transducer Type: A skimmer transducer is preferred; it stands off of your trolling motor a little further than a pod style which seems to help limit trolling motor interference.
ONCE YOU UNDERSTAND THE TERMINOLOGY, CHOOSING THE CORRECT GRAPH IS EASY!
Of these features, Mike Webb feels: “Peak to peak wattage is extremely important. Without the power you will never be able to get the detail needed to see your bait and the fish. Zoom is critical as well, you need to be able to zoom in and see the additional detail. Lastly, real time information is a must. Many graphs have a delay. Look for one that offers a feature like Flashgraph from Lowrance and you won’t have an issue.”
Most of these features will be listed when you are looking at graphs. If you are unsure, ask for help or go to the manufacturers website for assistance. Many of the manufacturers websites have a tutorial as well, and that can help you set up and understand your graph. If you already own a graph, most of these features can be accessed in the graph’s menu.
These are the basic terms and definitions used by the majority of the electronics manufacturers. While your graph may use different terms, all of the electronics on the market today utilize an LCD screen and similar settings and adjustments. In the next installment of this series we will describe the basic settings and adjustments you will need to properly operate your graph.
