Bottom LockThe Bottom Lock function applies a filter to flatten the image ofthe seabed and make any objects on or just above it easier todiscern. This feature is particularly useful for finding fish thatfeed close to the bottom.Bottom Lock is selected for individual fishfinder windows andcan replace or appear alongside the standard fishfinder image.Adjusting the range of the bottom lock image allows you to viewmore bottom details. You can also reposition the image onscreen to anywhere between the bottom of the window (0%) andthe middle of the window (50%) by using the Bottom Shift control.Bottom Lock is selected for individual fishfinder windows and caneither replace (ON) or appear alongside (SPLIT) the standardfishfinder image.Adjusting the bottom lock range/positionFrom the fishfinder application, with bottom lock display modeselected:1. Select Menu.2. Select Display Mode.3. Select Bottom Lock to switch between Full screen and Splitscreen4. Select B-Lock Range.Selecting Bottom Lock Range will display the B-Lock Rangedialog.5. Adjust the B-Lock setting to the required value.6. Select Back or use the Ok button to confirm the setting.17.13 Fishfinder rangeThe Range and Range Shift functions enable you to change therange of depth displayed by the fishfinder.RangeThe Range function enables you to define the range of depththat you see in the fishfinder display.By default, the fishfinder display shows the shallowest requiredrange, enabling you to clearly see what is near the surface of thewater under your vessel. This is useful for finding smaller fishthat feed nearer the surface. An example of this kind of depthrange is 0 to 200 feet. In this case, the range is 200 feet, so 200feet of water will be displayed on-screen at any one time.There may be circumstances in which you want to see a lessdetailed image showing a greater amount of depth beneath yourvessel. This is useful for locating bigger fish and other objectslocated closer to the seabed such as wrecks. An example of thiskind of depth range is 0 to 1000 feet or greater. In this case,the range is 1000 feet, and you will be able to see 1000 feet ofwater beneath your vessel, without needing to scroll the displayup or down.Range ShiftThe Range Shift function enables you to define which area of theoverall depth you want to be able to see on-screen. For example,if your range is 5000 feet and the display is showing the surface(0 feet) at the very top of the display, and 5000 feet at the bottomof the display, you can use the Range Shift function to focus on adifferent 5000 feet range. For example, 2000 feet at the very topof the screen, and 7000 feet at the very bottom of the screen.Example screen with range and range shift used to view theseabed at a depth range of 20–100 ftChanging the fishfinder depth rangeFrom the fishfinder applicationYou can choose from either:• automatic adjustment whereby the display automaticallyshows the shallowest required range.• manual adjustment of the depth range, up to the maximumdepth displayed on the scrolling bottom and A-Scope images.Changes to the range affect all fishfinder windows.1. Select Menu.2. Select Range.3. Select Range to switch between Auto and Man.4. With manual mode selected you can now use the RangeControls to adjust the depth range shown in the fishfinderapplication.Note: With the Range menu displayed you cannot use theRotary Control to range in and out. To use the Rotarycontrol to range in and out, first close the Range menu.Range in and outThe method of ranging in and out of the fishfinder application isdependant upon your multifunction display variant.The table below shows the Range controls available for eachdisplay variant.Fishfinder application 193
