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TITLE

Zooming, Scaling, and the + and - buttons

Created: 12/12/2003
Modified: 01/10/2006

DISCUSSION

There are two different settings available for the + and - buttons: Zoom and Scale and Zoom Only. To change between these settings, tap Setup, then Zoom Buttons.

Zoom and Scale
In the Zoom and Scale mode, the plus and minus buttons (at the lower right of the Navigator window) let you go in for a closer view, or move back to see a larger area. When you press the plus (+) button, the Navigator will zoom you in closer by a factor of approximately 50% (for roughly twice as close a view). Press the minus (-) button to move farther out from the chart, also by a factor of approximately 50%. This will let you see more area on-screen. In each case, the point at the center of your screen will remain the same.

In adjusting your view, the Navigator will either zoom in/out on the current chart, or switch to a chart of a different scale. This depends on the zoom level at which you are already viewing the chart, and on the availability of other charts for the area.

To adjust your view area with a little more precision, use the Scale Control, found at the lower right corner of the display. The Scale Control indicates the scale of the chart you're viewing. Press the Scale Control to choose from a list of all other charts available for the area shown on-screen.

Zoom Only
In Zoom Only mode, the plus and minus buttons (at the lower right of the Navigator window) let you go in for a closer view, or move back to see a larger area. When you press the plus (+) button, the Navigator will zoom you in closer by a factor of approximately 50% (for roughly twice as close a view). Press the minus (-) button to move farther out from the chart, also by a factor of approximately 50%. This will let you see more area on-screen. When in this mode, no Scaling (change of the chart) will take place. This will also make charts appear "blurry" or "blown up" when extreme zoom levels are reached.