GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONS7.2 Fish Finder DisplayThe fish finder screen provides a “picture” of the echoes found by the fish finder. Echoesare scrolled across the screen from the right position to the left position. The numberof minutes an echo is displayed on the screen is controlled by the picture advancespeed.The echoes at the right position are the current echoes. These echoes can be fromindividual fish, a school of fish, or the bottom. Depth to the bottom is indicated always,provided the gain is set correctly.Both low and high TX frequencies are provided. (Frequencies depend on the transducerconnected.) The low frequency has a wide detection area, which is useful forgeneral detection and understanding bottom conditions. The high frequency has anarrow beam width that helps you inspect fish.The range, gain, clutter and TVG can be adjusted automatically according to your purpose(cruising or fishing) to let you do other tasks.The color bar at the left edge of the display shows the range of colors used to displaydifferent echo strengths. Weaker echoes appear in colors near the bottom of the bar,and stronger echoes appear in colors near the top.Frequency(LF or HF)Mode (Fishing,Cruising or Manual)Auto Range(No indication formanual range)Minute marker(each bar is equalto 30 seconds)ZerolineColorbarVRMBottom echoSchool offishElapsed time,VRM depthRangescaleDepthindicationAppears when simulationmode is active.Note: The depth indication on the fish finder display is the sounding value from theinternal fish finder. The DEPTH indication in the data box is the sounding value fromthe equipment selected in the [INTERFACE] - [SELECT INPUT DEVICE] menu. Then,the depth value in the data box can be different if the data is fed from an external device.7-2