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4. Move the ShuttlePoint knob to highlight FISH FINDER and press [ENT] or move the ShuttlePoint knob to the right. CPF180i and CPF300i Page 109 5. Move the ShuttlePoint knob up/down to select OFF and press [ENT] or move the ShuttlePoint knob to the right. 6. Press [CLR] or move the ShuttlePoint knob to the left until the Chart page is shown. 17.1 UNDERSTANDING THE FISH FINDER PAGE The display on CPF180i and CPF300i shows a time history of the echoes received by the transducer. The CPF180i and CPF300i have a menu that allows adjustments to receiver sensitivity, depth range and scrolling speed of the Fish Finder display. Figure 17.1 - The Fish Finder page The following is a brief description of terms listed in the previous Figure: Warning Message Flashing label that is turned On when the echo sounder is in Simulation mode. The following is the list of the warning messages (see also Par. 5.8): · SHALLOW WATER · DEEP WATER · HIGH WATER TEMP · LOW WATER TEMP · WATER TEMP RATE · FISH SPOT · NO DATA Fish Finder window Graphic presentation of sonar soundings recorded as a continuous profile scrolling across the screen from right to left. Such recordings represent the image of the water beneath your boat, items appear as they pass under your transducer; the items on the right side of the screen are closer to you than those on the left. The correct interpretation of the Fish Finder page allows retrieving useful information about what is under the boat. Page 110 CPF180i and CPF300i Color Bar Colored scale located on the left side of the screen that shows the colors used in the Fish Finder page to represent the echoes strength. The color on the top of the bar represents the maximum echo strength, while the color on the bottom of the bar represents the minimum echo strength. Digital Depth Readout of the current bottom depth. Water Temperature Readout of the current water temperature returned by the temperature sensor included in DST520, DST521, DST523, DST526. Shallow Alarm Bar Located on the right side of the Range Bar, the Shallow Alarm Bar shows the range outside of which the depth measurement will trigger a Shallow Alarm. Range Bar Vertical graduated bar that is located along the right side of the screen. It is a scale which reflects the depth of the area being displayed. Variable Depth Marker (VDM) Horizontal line on to the Fish Finder page window with a depth label. Move the ShuttlePoint knob Up or Down to change the position of the VDM. The label displays the depth of the cursor position. The VDM can be moved to any location pinpointing the depth of a target. A-Scope Real time representation of fish and bottom features passing through the beam of the transducer, drawn as column of horizontal lines whose length and hue is proportional to the echo strength returned. The color of the echo strength depends on the selected display color. When the default palette is selected, the strongest sonar returns will be shown as red and weaker returns will be shown blue. Deep Alarm Bar Bar located on the left side of the Range Bar, showing the portion of the Echogram currently represented in the zoomed window (on the left part of the screen). It is turned On selecting the Echosounder Split page. Transmit Frequency Shows the selected depth transmit frequency. As a reference, 200kHz selection is normally used to see targets in depth up to 400Ft, and 50kHz is used in water over 400Ft. CPF180i and CPF300i Page 111 17.1.1 Understanding the Fish Finder display Figure 17.1.1 - The Fish Finder display Fishes Fishes are represented as arcs because of the cone angle of the transducer. In fact as the boat passes over the fish the leading edge of the cone strikes the fish, causing a display pixel to be turned on. As the boat passes over the fish, the distance to the fish decreases turning each pixel on at a shallower depth on the display. When the boat is directly over the fish, the first half of the arch is formed and since the fish is closer to the boat, the signal is stronger and the arch is thicker. As the boat moves away from the fish, the distance increases and the pixels appear at progressively deeper depths forming the remaining half of the arch. Thermoclines Are the zones where two layers of different water temperatures meet. The greater the temperature differential, the denser the thermocline shows on the screen. Thermoclines are represented as horizontal stripes of noise. They are very important for fishing since often many species of game fish like to suspend in, just above, or just below the thermoclines. White Line The White Line shows the difference between hard, soft bottoms and even distinguishes between fishes and structures located near the bottom. In this way it is easier to tell the difference between a hard and soft bottom and even to distinguish fishes and structures located nearby the bottom. For example, a soft, muddy or weedy bottom returns a weaker echo that is shown with a narrow white line while a hard bottom r...

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