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All this information is being put into memory in much smaller increments (pieces) than is being
displayed on the normal full depth scales. For example, on the 0 to 60 foot scale each dot is
equal to one foot of depth, but the computer is putting information into memory such that each dot
equals 3 inches.
If after reading this, you don't understand now Total Screen Update works, don't worry. The
important thing is that you understand how to use Total Screen Update. Read on....
How To Use Total Screen Update
This is the easiest part. Since the LCR's computer is doing all the work, you will find the LCR
Total Screen Update very easy to use.
There are two ways that you will use Total Screen Update:
1. When changing a depth scale, the LCR's computer will automatically change or update
the entire screen to the new depth scale. This Total Screen Update feature works when
changing to deeper or shallower scales. For example, suppose you are in the 0 to 120
foot scale but the bottom depth changes quickly to 20 feet. When the depth range is
changed to the 0 to 30 foot scale, the entire screen will look just as if you had gone over
the area on the 0 to 30 foot scale.
2. The second way that you will use Total Screen Update is in operating the LCR's Zoom or
Bottom Lock. Since the computer has stored in memory information in very small
increments, you will be able to recall this information from memory to get an expanded
view of areas which you have already passed over.
For example, if you go over some interesting structure or fish, you will be able to zoom in for a
closer look without going back over the area. Simply activate the zoom and the in-
formation that is stored in memory will be recalled and displayed on the left side of the screen.
(See Figure 15.)
The operation of the zoom function is explained in a later section.