Humminbird ] 981 - Manual (Page 59)

BOTTOM LOCK
(Sonar Zoom View only)
Bottom Lock changes the mode of the Zoomed view in the Sonar Zoom View.
To turn on Bottom Lock:
1. In the Sonar Zoom View, highlight Bottom Lock on the Sonar X-Press™ Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Bottom Lock
setting to on. (Off, On, Default = Off)
BOTTOM RANGE
(Sonar Zoom View only, when Bottom Lock is On)
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. 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.
To adjust the Bottom Range:
1. In the Sonar Zoom View, highlight Bottom Lock on the Sonar X-Press™ Menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the Bottom Lock
setting to on. (Off, On, Default = Off).
3. Once you turn on Bottom Lock, the Bottom Range X-Press™ menu choice will be
displayed. (10 - 60 feet, 2-10 fathoms, or 3-20 meters [International Models
Only], Default = 15 feet)
SONAR COLORS
Sonar Colors allows you to select which color
palette you would like to use for the display.
To change the Sonar Colors:
1. Highlight Sonar Colors on the Sonar X-Press™menu.
2. Use the LEFT or RIGHT 4-WAY Cursor Control keys to change the color palette.
(Standard, Gray, Inverse, Green, Default = Standard)
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