Humminbird i-PILOT LINK Operation Manual page 64

Set the Water Level Offset
Before starting navigation, set the Water Level Offset setting to change the water level read by the HELIX control head. For example,
if the lake is down 5 feet, set the Water Level Offset setting to -5. The displayed numbers on the Contour Lines will adjust from the
Water Level Offset setting, and the water level offset will be highlighted in brown to extend the land visually on the display.
NOTE: A Humminbird LakeMaster map card must be installed and selected as the map source to enable these features.
1. Main Menu: Press the MENU key twice. Select the HB Chart tab.
2. Select Water Level Offset.
3. Press the RIGHT or LEFT Cursor keys to adjust the setting.
If the water level is higher than normal, set a (+) positive amount.
If the water level is lower than normal, set a (-) negative amount.
If the water level has not changed (normal), set Water Level Offset to (0) zero.
Water Level Offset (Set to 0 = Off) Water Level Offset Adjusted to -4
If the water is lower than normal, set the Water Level Offset to a negative
number, and the land will extend visually on the map (as shown above). If the
water is higher than normal, set the Water Level Offset to a (+) positive amount,
and the water line will extend visually on the map.