Bottom Range (Sonar Zoom View Only When Bottom Lock Is On); Bottom Lock (Sonar Zoom View Only); Reset Xte (Only When Navigating) - Humminbird 688ci HD DI Operation Manual

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 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.
Reset XTE is available during navigation. When it is selected, the cross track
error (XTE) will be recalculated from the boat's current position to the next
waypoint in the route.
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 ft
Bottom Lock
(Sonar Zoom View only)
Settings: Off, On; Default = Off
Reset XTE
(only when Navigating)
Settings: Press the RIGHT Cursor key to activate.
87 Sonar X-Press™ Menu