Raymarine L470 instruction manual Bottom Lock Mode, Operating Instructions

BOT

LOCK

Bottom Lock Mode

Top and bottom of Bottom Lock range

Bottom indication

Bottom depth below surface

Bar indicates area being displayed

Fig. 3-15

Bottom Lock Mode

The normal display on the FishFinder is a “top-down” view, as if it was seen from the surface of the water. The Bottom Lock Mode shows a “bottom-up” view. The bottom is used as a reference, and all depths are measured up from the bottom.

You can reach the Bottom Lock Mode at any time by pressing the button. For a moment, the display will say, “ENTERING BOTTOM LOCK,” then the Bottom Lock image will appear.

Figure 3-15 shows the FishFinder Page with the split Bottom Lock feature enabled. The right section of the split image shows a section of the normal FishFinder Page. The left section shows the Bottom Lock image.

Bottom indication

The actual surface of the bottom under your boat varies in depth and contour. The bottom lock feature “flattens out” the bottom image to give you greater visibility of fish targets or structure resting on or near the bottom. On the Bottom Lock image, the bottom itself is shown as a flat surface, and all targets are shown relative to this flattened bottom.

When using Bottom Lock, you will probably want to keep the Range (not the Bottom Lock Range) set to Auto. If the Range is set to Manual, and the bottom moves deeper than

54 Operating Instructions