Furuno Ls4100 - Manual (Page 14)

8
1.8 Measuring Depth
The VRM (Variable Range Marker)
functions to measure the depth to fish
schools, etc.
1. Press ▲ or ▼ to place the VRM
on the object which you wish to
measure range.
2. Read the VRM depth just above
the VRM.
0
20
40
60
80
49.6
39.8
VRM
VRM depth
50k 1/1
How to measure depth with the VRM
1.9 Choosing Picture
Advance Speed
The picture advance speed determines
how quickly the vertical scan lines run
across the screen. When choosing a
picture advance speed, keep in mind
that a fast advance speed will expand
the size of the fish school horizontally
on the screen and a slow advance
speed will contract it. Note that the
picture is not refreshed when picture
advancement is stopped. Therefore,
use caution when steering the vessel
under this condition.
Fast Slow
Picture and picture advancement speed
1. Press the [MENU/ESC] key to open
the main menu.
2. Choose PIC. ADVANCE from page 1
of the menu.
3. Press ► to show the options
window.
Stop
1/16
1/8
1/4
1/2
1/1
2/1
4/1
(
)
Fast
Slow
Picture advance options window
4. Use ▲ or ▼ to choose picture
advance speed desired. The
fractions in the options window
denote the number of scan lines
produced per transmission. For
example, 1/8 means one scan line is
produced every 8 transmissions.
“Stop” freezes the display and it is
convenient for taking a photo.
The picture is not refreshed when
picture advancement is stopped.
Maneuvering the vessel in this condition
may result in a dangerous situation.
CAUTION
5. Press the [MENU/ESC] key to close
the menu.