User manual RAYMARINE APELCO 465 FISHFINDER

[. . . ] Distributed by Any reference to Raytheon or RTN in this manual should be interpreted as Raymarine. The names Raytheon and RTN are owned by the Raytheon Company. Echo Sounding How it Works x Your eyes underwater An "echo sounder" or "sonar" unit sends high-frequency sound waves down into the water below a boat. The display unit measures the time delay as the signal goes out and returns. The FishFinder uses this information to display a graphic image of the bottom conditions. [. . . ] The 465 remembers this value after the unit is turned off, provided the unit is shut off using the PWR button. The Log may be reset to zero from Speed Log 46 Operating Instructions the Setup Menu. (See page 46 for details. ) Battery The measured DC voltage of your boat's battery. Elapsed Time The amount of time which has passed since turning the unit on, in Hours : Minutes : Seconds. The Elapsed Time may be reset to 00:00:00 from the Setup menu when the Digital Page is visible. (See page 75 for details. ) Temperature The measured temperature of the water at the transducer, in degrees Fahrenheit or degrees Celsius, depending on your selection in the System Setup Menu. (See page 23 for details. ) The temperature variation over time is displayed in a scrolling graph. The graph is updated once every 30 seconds, so a one-hour history can be displayed by the unit. Operating Instructions 47 FishFinder Page Zoom Mode ZOOM A-Scope Mode A-SCP Bottom Lock Mode BOT LOCK Fig. 3-12 Performance Modes 48 Operating Instructions Performance Modes This unit has three "performance" modes which can be used to add to the standard FishFinder Page. Each mode presents the raw information from the transducers in a special way. To reach one of these modes, press the corresponding button on the unit. 3-12. Zoom Mode Zoom display (magnified) Normal display Top of zoom area Bottom of zoom area Zoom magnification Line indicates zoom area Fig. 3-13 Zoom Mode The Zoom Mode gives you a way of enlarging or magnifying all or part of the display area. (The "zoomed" display is actually larger only in the vertical direction. ) You can reach Zoom at any time by pressing the ZOOM button. For a moment, the display will say, "ENTERING ZOOM MODE, " then the zoomed image will appear. In this "split" display, the right side shows the same information as the FishFinder Page. In each case, the new information appears at the right edge of the display, and moves to the left. Operating Instructions 49 Many of the items presented by the Zoom Mode are the same as those on the FishFinder Page. There are a few additional items: Zoom magnification This indicates the amount of "zoom" or magnification. You can choose an x2 view (double the normal display size), x4, x6 or x8. You must also select the area or "window" of the water you want to zoom. Zoom area When you turn on the zoom feature, it can only enlarge a part of the FishFinder Page. As we said, the right side of the "split" display shows the normal FishFinder Page. The vertical line at the right edge of this display shows the area or "window" of the water being enlarged. [. . . ] Stern: The rear of a boat (nautical term). Thermocline: A level in the water where two areas of differing water temperature meet. Sometimes a thermocline can reflect sonar waves and present a false display. Transducer: A device which sends and receives high frequency sound waves through the water. Transom: The rear-most part of the boat's hull, often a flat panel. [. . . ]