Zoom
Another form of range control is Zoom. The Zoom menu allows three different settings; Zoom Off, Zoom On, and BL or Bottom Lock. Zoom allows selection of various ranges for full screen viewing, not necessarily including the surface. By using the display to view a smaller area, the effective display resolution is increased, and the units ability to separate targets close together is enhanced.
The zoom range is determined by the depth range in use when zoom is enabled. In shallow water, when the 15' or 30' depth range is used, the zoom range will be
To enable zoom, adjust the depth of the zoom range first using the UP and DOWN Arrow buttons until the upper and lower limit numbers correspond with the range you wish to view, then enable Zoom using the ENTER button.
Once you are in Zoom, you may still adjust the depth of the zoom range by using the UP and DOWN Arrow buttons. The Zoom menu will not appear when an adjustment is made unless MENU is pressed.
The digital depth readout will continue to track the bottom even when Zoom is enabled.
Bottom Lock is a function of Zoom, except the depth adjustment is controlled automatically to view the area immediately above the bottom. This is especially useful if you are looking for structure or minor variations in terrain in areas of relatively flat
bottom terrain. To enable Bottom Lock, press ENTER until the BL is highlighted. The Zoom range will be controlled by the current depth range, as in Zoom, and will be indicated on the Zoom menu.