Humminbird LCR 4000 Operation Manual page 24

USING THE LCR 4000
OPERATIONAL INSTRUCTIONS
The Zoom may be activated at any time (during normal transmitting and receiving or
stop action, or reverse), but while learning to use the Zoom feature you might find it
easiest to first press the Stop/Resume button to freeze the display. Now you can
position the Zoom Range, activate the Zoom, and study the display. By pressing the
Zoom On/Off button again you can go back to the un-expanded or normal display.
Going back and forth several times will help you in understanding exactly what you are
seeing with the Zoom activated.
Some Additional Things You Should Know About Zoom
A. While the Zoom is turned on you can move the Zoom Range up and down. This will
allow you to search or look at an entire area in fine detail.
B. You can also zoom in on information that has gone off the screen by pressing the
reverse button. This can be done by either reversing and then activating the Zoom or by
activating the Zoom and then reversing. See Section 6 for reversing instructions.
C. The Zoom Range indication at the right of the display can be used for depth
reference. For example in Figure 15 the Zoom Range is set between 17 ½ feet and 25
feet. This means that when the Zoom is activated that you are looking at an expanded
view of the area from 17 ½ feet to 25 feet.
D. While the Zoom is turned on, you cannot change Sensitivity, Depth Scale, or Display
Speed. If you press any of these buttons while Zoom is on, a chirping sound will occur
indicating an incorrect entry.
E. Using the Zoom you can actually have a 0 to 7 ½ foot scale on your LCR4000. To do
this, first position the Zoom Range as far up as it will go on the 0 to 15 ft scale. Now turn
on Zoom. The full screen is now a 0 to 7 ½ foot scale.
F. Remember that because of the LCR4000's Total Screen Update feature the
information from 0 to 120 feet is always being recorded in memory. This means that
even while you are using Zoom, no information is being lost. You can turn Zoom off, go
to any depth scale and see all the information just as if you had been on that depth
scale all along.
Bottom Lock:
Your LCR4000 has a very unique bottom lock feature. To activate bottom lock, hold
down the zoom on/off button for 1 to 2 seconds. The "Z" in the lower right of the display
will come on indicating that it is activated. Bottom lock works very similar to zoom
except that the zoom region always stays on the bottom, therefore giving an expanded
view from the bottom up. You will notice that as the bottom depth changes, the zoom
cursor will change to maintain its position on the bottom