Furuno TS-331A - Manual (Page 30)

2. SONAR OPERATION
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2.8 Grid
You may configure the grid on the vertical sonar display as desired from the
Grids menu.
Grids menu, Scale Options, Scale Text Size selected
Grids menu description
Circular grid:
Check to display a circular grid.
Square grid:
Displays a square grid.
Circular grid Square grid
Circular and square grids
No Grid:
Check to turn off grid.
Scale options:
Turns scale on or off, turns shadow behind scale on or off, and
chooses text scale text size.
Enable Shadow:
Check to enable shadowing behind scale.
Choose Shadow Color: Click to display color dialog box to
choose color of shadow.
Scale Text Size:
Choose text size from small, medium, large,
larger and largest.