Do not apply the strong shock on LCD panel or unit.
Do not put the object on LCD panel.
LCD unit inside the main unit is made by glass. When some shock is applied
on LCD panel or unit, it may be broken.
When temperature of unit exceeds 70
℃
, it causes to faulty. Please be more
careful to operate or store it under direct sun ray in the mid-summer and use it
carefully where it is in the shade as possible. Please avoid to keep it in the
trunk of car.
If the unit becomes high temperature, it’s brightness decreases automatically to
protect the LCD. It is not trouble.
Avoid high temp. place
Careful carrying and handling
2. General Information of fish finder
1. Theory of fish finder
●
Theory of fish finder is same as echo.
Ultrasonic pulses transmitted from the transducer into the water are reflected from fish school
or the sea bottom and then they are received by transducer.
Fish finder converts round-trip time between the time and the ultrasonic wave is
transmitted and the time the reflected wave is received into distance and measures the
depth. It display of fish school, the outline of bottom or nature of bottom on the screen in
different colors. Each time when image is sent by one line to the left, ultrasonic wave is
transmitted right edge of screen in different colors.
4
2. How to distinguish the fish school
●
Importance is comparison between display of fish school and catch
It is possible to distinguish sort by display of fish school to some extent. But even if fish
sort is same. Its form making school is different according to difference of fishing ground
and difference of time (day and night, four seasons, variation of current).
The important thing to distinguish the fish sort is to know the sort according to their
fishing ground or fishing period and to find the useful point on the display by comparing
between display of fish school and actual catch.
3. How to distinguish the fish volume
●
Fish volume can be distinguished by density and size of fish school
As the harder density the transmitted wave is reflected strongly, you can distinguish the
density of fish school according to the strength of reflected echo (that is, different color).
Normally we tend to think the larger fish school on the screen the most fish volume. But
when fish school are located at the shallow depth and the deep depth, fish school at the
deep depth is displayed bigger than at the shallow depth. Because the transmitted wave
spreads wider as it goes shallower. As this result, the deeper depth becomes the wider the
