Yachting Electronic Co. FC80, Руководство пользователя

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change in depth.
New returns graphed at a different scale will not match up
with the historic data already graphed at a higher or lower
scale.
3. Water surface line 3. Water surface line
The water surface line indicate the displayed position of
water surface on the screen, which is very helpful for you
to estimate the depth of
detected fish.
For example,
the current depth reading
is 18 m, and the position
of fish-a icon(B) is about
1/3 of total depth( A), thus
the 1-fish lies on the position
about (18.6*1/3=)6.2m deep
from water surface.
Accordingly, you could estimate the fish-b lies about 1/2 of
the A total depth, which is (18.6*1/2=)9.3m.