User manual NAVMAN FISHFINDER F400

[. . . ] The 400 series is a powerful, yet easy to use sonar fish and bottom depth detector. Please read this manual carefully before installing and using your fishfinder. This manual deals with both the FISH400 and FISH440. The more you know and understand about the capabilities of the unit, the better it will perform for you. [. . . ] Certain types of fish have larger swim bladders than normal so the size of the icon is not always a reliable way to indicate the relative size of the fish. In the Autofish mode, unnecessary surface noise is reduced from the top of the screen. This mode is recommended when your boat is moving along at higher speeds. This feature displays an intensity graph of the current echoes down the right hand side of the screen. The information can be used to help determine the type of bottom structure and the size of fish. The strength of the echo is proportional to size or number of pixels visible in the analogue section of the screen. This feature will help to determine the strength of the return echo from the bottom and therefore how hard or soft the bottom may be. In this mode the depth, speed and temperature are displayed in large easily readable digits. This is useful when navigating to your favourite fishing location. The depth of the bottom in feet, metres or fathoms. The speed of the boat in mph, knots or kph. The log will display the total distance in the speed unit you have selected. The log total is automatically stored in memory when the power is switched off or removed but this value can be reset to zero (see SETUP menu). When either or all of the Fish (F), Shallow (S) or Deep (D) alarms are active they are displayed at the top left corner of the screen. There are three different range modes; Top, Bottom, and All. If Top is selected then a lower depth limit value must also be selected. This mode locks the display to show only echoes from the surface of the water down to the lower depth limit you have selected. This means that the sea bed may not be shown if the water is deeper than the selected lower depth limit. If Bottom is selected then an upper depth limit must also be entered. This mode locks the display to show only echoes between the sea bed and the upper depth limit you have selected. The top of the water may not be shown if the water is deeper than the upper depth limit. This feature is like a ZOOM function, as it allows you to see the bottom contour and fish echoes above the bottom in greater detail. [. . . ] The calibration value is saved in memory automatically. Reset log The distance log can be reset by changing this option from `NO' to `YES'. If the selection is YES, the log will be reset when you exit this menu. Press either the key or the key to move the pointer to the required setup item Use the V or the ^ key to adjust the setting to the desired value Press the key to accept the choice and return to normal display mode Check the power cable socket at the back of the Fishfinder. [. . . ]