NorthStar 8000i System Operation Manual page 206

Z
zoom
Increase or reduce the scale of a display to enlarge or reduce the level of
detail visible.
zoom bar
The extent of the vertical range of water that is enlarged in the zoom
section.
zoom offset
The location of the vertical range of water that is shown by the zoom bar.
zoom range
The area of the display that is enlarged.
zoom section
The portion of the display screen that shows the zoomed area.
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Northstar 8000i Operation Manual