Eagle Electronics FISH MARK 500CDF - Manual (Page 77)

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Overlay Data command on the Sonar Menu, at left. Overlay Data
Shown selection menu, right. In this example, Depth will be displayed
in a large font.
When selected, the data type shifts to the top of the data list and a
check mark appears beside the data type. (If you wish, you may now
use
↓ or ↑ to select other Data Types for display.)