Raymarine L365 - Manual (Page 41)

36
Operating Instructions
A shallow arch or horizontal line is
generated when the boat is moving
slowly or stopped.
An arch-shaped image indicates a fish.
This indicates a group of small fish.
This shows a fish detected in
sidelooker mode.
When the boat is moving very fast,
a fish appears as a single vertical line.
The same fish appears differently
when shown by the 50 kHz or 200 kHz
transducer beams.
50 kHz
200 kHz
Fig. 3-5
Fish
Indications
Bottom Indications
The bottom usually produces a strong echo, so it is easy for the
FishFinder to see a lot of detail. The FishFinder can indicate many
different kinds of bottom conditions. See Fig. 3-6. A hard bottom appears
as a thin line. A softer bottom or a bottom covered with seaweed will
produce a wide line, as the sound waves reflect from different layers of the
bottom. An uneven bottom which is covered with rocks or coral produces
a complex display like that shown in the last part of Fig. 3-6. The bottom
image is irregular, with long “tails” pointing upward. A wreck produces a
similar image.
When the White Line feature is turned on, the unit can display even more
information about the bottom. In Fig. 3-4, the FishFinder is getting a good
echo from the bottom, so the upper layer of the bottom is shown in a
checkerboard pattern.