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Charting: How to call up other charts at ones current location

Created: 12/11/2003

TOPIC

These are several methods for selecting larger or smaller scale charts at ones current position


DISCUSSION

There are several ways to call up the next available, or a more detailed chart:

1. Chart Outlines:

Chart Outlines are black, rectangular outlines that indicate areas covered by larger-scaled Maptech charts.
To find out the chart's ID and scale, hover the cursor over any corner of the outline. This highlights the outline in green for easy visibility, and the chart's ID and scale are displayed in a small popup window.
To open the chart, double-click the outline's corner.

Chart Outlines are shown on the World Chart and in any other area for which larger-scaled charts are available.

To enable Chart Outlines, choose Options from the View menu and check Show Chart Outlines.

2. Using the Toolbar:

Toolbar: Click on either the Scale In or the Scale Out button to switch to the next available chart (the chart whose scale is closest to the current chart). Click on the Max Scale button to go straight to the largest-scale chart (the most detailed scale) available for the area you're viewing.

3. Link chart to chart:

Offshore and Chart Navigator lets you 'link' charts- simultaneously display two or more charts that share the same center LAT/Lon. This lets you view different chart scales for the same area, or view different types of coverage (nautical chart and topographic map, for instance).

To do this, use the Charts menu and choose Link Two Charts at Location. A modified Chart List window will appear, listing only those charts that cover the lat/lon of the point at the center of your screen. Highlight a chart title and press Open Chart, and the two charts--your original chart plus the one you just opened--will appear side-by-side on the screen. Whenever you scroll or drag one chart, the other chart will follow so that both charts are always centered on the same lat/lon.

This lets you view different chart scales for the same area, or view different types of coverage (nautical chart and topographic map, for instance).


4. The Overview Window

The overview window appears as an inset in a corner of your screen. You can click on its title bar and move it if you like. The overview shows a zoomed-out view of the active chart. It serves as a visual reference so you can see how the area that you're viewing fits into the 'big picture.'

The red rectangle in the overview window indicates the boundaries of your computer screen. You can use it to view different parts of the chart: click-and-drag the red rectangle to another portion of the overview, and the area enclosed by the rectangle will be displayed in the main window.


5. Scale Boxes

You may also use the small boxes in the lower left hand corner of the screen, each one of these boxes is a shortcut to other charts you have available that share lat/lon with your current screen position. Blue boxes signify NOAA marine charts, Red signify Navigation Photo charts, and Green signify USGS Topo quads. The more to the left that the box is, the larger scale it is.






 


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