12.5 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 depth thatyou 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 fish thatfeed nearer the surface. An example of this kind of depth range is 0to 200 feet. In this case, the range is 200 feet, so 200 feet of waterwill 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, therange is 1000 feet, and you will be able to see 1000 feet of waterbeneath your vessel, without needing to scroll the display up ordown.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 top ofthe screen, and 7000 feet at the very bottom of the screen.Example screen with range and range shift used to view the seabedat a depth range of 40–80 ftChanging the fishfinder depth rangeYou can choose from either:• an automatic adjustment whereby the display automatically showthe shallowest required range.• manual adjustment of the depth range, up to the maximum depthdisplayed on the scrolling bottom and A-Scope images.Changes to the range affect all fishfinder windows.1. Press the RANGE button.2. Toggle to AUTO or MAN using the RANGE softkey.3. Use the rotary controller to adjust the depth range.4. Press OK.Using fishfinder range shiftThe DSM automatically adjusts the display to keep the bottom inthe lower half of the display window. Alternatively you can shift the172 E-Series Widescreen User reference
