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48 GPSMAP 400/500 Series Owner’s Manual
Using Sonar
Zoom—zoom in to a section of the full screen. The zoom is off, or
set to No Zoom by default. Four options are available:
No Zoom—turns zooming off.
2x Zoom—twice the magnication.
4x Zoom—four times the magnication.
Bottom Lock
—locks the zoom window to the bottom.
Split Zoom—displays the Split Zoom screen (page 45).
Depth Line
—quickly reference a specic depth (Show or Hide). To
set the depth of the reference line, select Show, and then press up or
down on the Rocker.
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