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TIDE EFFECT
The tide effect display is useful for estimating three-dimensional deformation of cast net by the
effect of tides at different depths. Notice that display merely shows movements of layers; it does
not show true net shape in the water.
Assume that you put drifting marks (virtual
buoys) on the net at each layer below the ves-
sel at an interval of six seconds.
As the marks move with the tides keeping the
same speeds and directions, a series of marks
makes a brief section shape of the net at the
layer.
In practice, a net does not sink immediately,
because of various tensions and stresses placed
on it. Thus, use the tide effect information only
as a reference.
Cast mark
(Start of tide effect plot)
` To start "tide effect plotting", press the
` To stop plotting and to clear traces, press the
TIDE VECTOR/COURSE PLOT SECTION
Display
Virtual
buoys
TIDE
key.
EFFECT
TIDE
EFFECT
Layer 1 (YEL)
Virtual
Layer 2 (PPL)
buoys
Layer 3 (L-BLU)
Interval
(6 sec)
Buoy track of layer 1 (YEL)
Buoy track of layer 2 (PPL)
Buoy track of layer 3 (L-BLU)
Ship's course track (WHT)
key again.
Layer 1
Layer 2
Layer 3
100 points max.
( = 10 minutes)
3-13
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