Humminbird 4090501 Bottom Lock, Bottom Range, (Sonar Zoom View only), (Sonar Zoom View only when Bottom Lock is On)

For example, when you’ve deviated from a route to navigate around an island, select Reset XTE to update the unit’s course calculations from the current boat position instead of from the previous waypoint in the route.

Bottom Range(Sonar Zoom View only when Bottom Lock is On)

Settings: 10 to 60 feet, 2 to 10 fathoms, or 3 to 20 meters (International Models only); Default = 15 feet

Bottom Range allows you to control how much of the water column, measured up from the bottom, is shown in the Sonar Zoom View. Choose a small value to see low-lying bottom structure or details of the bottom return. Choose a larger value to see large structure in deeper water.

NOTE: It is possible to set the Bottom Range to be greater than the depth. In this case, you may see surface clutter in a wavy band that mirrors changes in the depth.

Bottom Lock(Sonar Zoom View only)

Settings: Off, On; Default = Off

Bottom Lock changes the mode of the zoomed view in the Sonar Zoom View. Bottom Lock continuously graphs the bottom at a constant point on the display regardless of changes in depth. This “flattens“ out the bottom contour but is effective at showing fish on or near the bottom.

Sonar X-Press™ Menu 86