Humminbird 700 SERIES 798CI - Manual (Page 114)

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Lower Range
Lower Range sets the deepest depth range that
will be displayed by the unit. Auto is the default setting.
Auto: The Lower Range will be adjusted by the unit to follow the bottom
automatically. Auto is the default setting.
Manual: You can adjust the Lower Range to lock the unit on a particular depth.
“M” will be displayed in the lower right corner of the screen to indicate the unit
is in Manual mode. Adjust the Upper and Lower Range together to view a
specific depth range, especially when looking for fish or bottom structure.
NOTE: A minimum distance of 10 feet will be maintained between the Upper and
Lower Range regardless of the manual settings entered.
To adjust the Lower Range:
1. Highlight Lower Range on the Sonar X-Press™ Menu.
2. Press the RIGHT or LEFT Cursor keys to increase or decrease the Lower
Range setting. (AUTO, 10 to 1500 feet, 3 to 500 meters [International
Models only], Default = AUTO)
For example, if you are fishing in 60 feet of water but are only interested in
the first 30 feet (surface to a depth of 30 feet), you should set the Lower
Depth Range limit to 30. The display will show the 0 to 30 foot range, which
allows you to see a more detailed view than you would see if the display
went all the way to the bottom.
Sonar X-Press™ Menu