Furuno TS-331A - Manual (Page 38)

3. ECHO SOUNDER OPERATION
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3.4 Drawing Lines and Symbols
The procedure for drawing lines and symbols on the echo sounder is similar to
that for the sonar display. For details, see paragraph 2.4.
3.5 Grid
You may display a line grid on the echo sounder display. Check Line Grid on the
Grids menu to display the grid.
10 M
20 M
30 M
40 M
50 M
Line grid
3.6 Zoom
Zoom Factor on the View menu lets you choose the zoom magnification, from
100, 125, 150, 175, 200, 300, and 400 (%).
3.7 Colors
You may choose the color arrangement for the echo sounder. Open the Color
Table menu and check color desired. For details, see page 21.