Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 45)

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5 - Chart Management
Zooming/Overzooming
Use the following methods to zoom in or out:
Press + and - on your keyboard
Click your mouse scroll button on the chart once and then scroll up or down with
the scroll wheel (if your mouse is so equipped) to zoom in or out.
Drag Zoom. Drag and drop the mouse diagonally across the screen to create a
rectangular zoom-in field.
WARNING:
Jeppesen Workboat Navigator contains a safety feature called
“Overzoom Notification”. If a chart is displayed on the screen at a resolution
greater than its source scale, gray vertical lines appear on the chart (see
Figure 5.1). You can turn this feature on and off using Tools | Options.
Figure 5.1 - Overzoom Feature
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