Furuno CH-270 - Manual (Page 70)

3. VERTICAL SCAN MODE
3-16
3.11.6 Choosing horizontal range expansion factor
You may choose the horizontal range expansion factor for the vertical scan picture, from
x1 or x2. Note that this feature cannot be adjusted when the vertical search mode,
activated by a function key, is turned on.
1. Press the [MENU] key to open the menu.
2. Press ▲ to choose MENU at the top of the screen.
3. Press ◄ or ► to choose the VERT menu.
4. Press ▲ or ▼ to choose HORZ RANGE.
5. Press ► to open the dialog box.
6. Press ◄ or ► to choose x1 or x2 as appropriate.
7. Press the [MENU] key to register your selection and close the menu.