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Now press the left arrow key to change the
upper limit or the right arrow key to change
the lower limit. After pressing the key, a
screen similar to the one at the top of the next
page appears.
UPPER AND LOWER LIMITS
You can enter any range when the unit is in the manual mode. The unit lets
you enter any upper and lower limit, provided there is at least five feet
separating them, for example, from 20 to 25 feet. (On the screen below left,
the upper limit is 0 and the lower limit is 60.) Using the upper and lower limit
range option, we changed the range from 0 to 60 feet to 24 to 54 feet. This
"zoomed" the display to a 30 foot range.
As you can see, the fish arches near the bottom are much larger and easier
to see. In fact, a possible fish on the bottom shows on the enlarged screen
that is not even visible on the left! Not only does this make it easier to see
targets, but you can more accurately determine their depth, due to the
expanded depth range.
To change the upper and lower limits, first press the MENU key. Next,
make certain the unit is in the manual mode, then press the up or down
arrow keys until the "Set Chart Limits" menu appears as shown below.