GP1670F_1870F Operator's Manual - Furuno USA

7. FISH FINDER OPERATIONS4. Press the ESC/MENU key to close the menu.7.12 White MarkerThe white marker displays the selected echo strength in white.Use this feature to distinguish fish near the bottom from thebottom echo.Open the full RotoKey menu then select [Sensitivity] and00[White Marker] to show the [White Marker] window. Select[On]. Select the current the value, push the RotoKey TM , rotatethe key to set the echo strength number to display in white then push the key. Thehigher the number, the stronger echo is displayed in white. The selected color ismarked in white on the color bar.Off7.13 White LineThe white line feature displays the leading edge of the bottomecho in white to help you distinguish bottom fish from the bottomecho.White Edge Off0%Open the full RotoKey menu then select [Sensitivity] and[White Line] to show the [White Line] window. Select the value,push the RotoKey TM , rotate the key to set the width thenpush the key. The larger the number the greater the width of the line. Select [WhiteEdge On] to show the contour of the bottom in white.7.14 AlarmsThere are four types of alarms that produce audio and visual alerts to alert you fishwithin an area, fish length, and bottom type.The fish alarm alerts you to a school of fish in the alarm zone.The fish alarm (B/L) alerts you when a fish is within the specified distance from thebottom. Available when the bottom lock display is active.The fish size alarm alerts you when a fish of the specified length is in the alarm zone.Available when the ACCU-FISH TM feature is active.The bottom type alarm alerts you when the bottom type (rock, sand, mud, gravel)matches both the bottom type and probability percentage selected. Available whenthe bottom discrimination display is active.When the conditions of an alarm are met, the buzzer sounds and the applicable alarmicon appears at the top of the screen. Silence the buzzer by pressing the ESC/MENUkey. The icon remains on the screen until the offending alarm is disabled or the conditionthat caused the alarm has ended.7-14