Lowrance electronic LCX-17M - Manual (Page 118)

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The Two Maps page with one window stacked on top of the other.
3. To change the window size again or revert back to the original
display, just follow the steps above. (Most dual-window displays use
half the screen for each window by default.) You can also use the Reset
Options command to revert to the factory default.
Map Menu with Resize Window command selected (left). Pressing
→
moves the centerline and enlarges the left window (right).
The following page contains a 12-step quick reference for the most basic
GPS operations. If you don't want to carry the manual with you as you
practice with the unit, you might consider photocopying this quick
reference page and tucking it into your pocket.