Interphase Twinscope Operation Manual page 38

panel knob) and notice the vertical bar moving downward
in the center of the display which shows the depth area
that is being "zoomed". By using the "ZOOM " and
"ZOOM " soft keys, you can zoom in on particular
depth areas. The Zoom feature expands any 25% section
of the current depth range on the left half of the screen, or
effectively magnifies the section selected by the zoom bar
by 400%.
If you move the zoom bar all the way to the bottom of the
display, the Bottom Track and the Bottom Lock
features can be activated.. When the Bottom Track
feature is activated, the Zoom Bar changes to a thin bar
extending from the top to the bottom of the display.
Pressing the "ZOOM " button once more activates the
Split Screen Bottom Lock Display
Bottom Lock feature. When in Bottom Lock, the Zoom
Bar changes to a thick vertical line extending from the top
to the bottom of this display. Move the zoom bar up to
return to the regular zoom operation and turn Bottom
Lock off. Moving the zoom bar all the way to the top of
the display turns the Zoom off and returns you to full
screen bottom history.
Fish Symbol (Turn on/off)
Pressing the soft key labeled "FISH" turns the fish
symbol on or off. When turned on, the "FISH" soft key
will be shown in reverse video and the Twinscope's
microprocessor will scan the output of the receiver and
looks for specific patterns which it has been programmed
to recognize as fish. If it thinks it "sees" a fish, it creates
a fish symbol in place of the normal blob or arch. Press
Zoomed Display with Fish Symbols ON
the "FISH" soft key to turn this feature off.
Display Scrolling Speed Adjustment
Pressing the button shown as "SCROLL" will change the
speed at which the display moves from right to left
(scrolls). The display scrolling rate will change each time
you press this soft key from: FAST, SLOW or STOP.
Faster scrolling rates are generally used when you want to
see the maximum detail possible while slower speeds are
used when you want to slow the display to show the
maximum amount of bottom history.
38