Chart Groups

Chart Groups solves the following problem: You may have many charts loaded in your active database. Some of them have overlapping coverage at the same scale, so that when quilted the logic does not know which of potentially several
Another example: Pilot charts as one Group, normal navigation charts as another Group, makes it possible to quickly switch between them.

Final example: in another universe, NGA charts in one group, standard NOAA RNCs in another, British UKHO in a third group.

The Chart Group function allows us to define multiple Groups, with different chart directories in each group. The Group desired for viewing may be selected quickly without adding or deleting charts from the Active database.




In Options ->Charts, select "Chart Groups"
You will see two panes. The top pane contains you installed ("Active") chart directories. The bottom pane allows you to create, edit, and delete Groups. Note that there is always an "All Charts" group. This Group is not editable. New Groups which you create may have chart directories or individual charts added to them by selecting the item in the top pane and touching the "Add" button.
You may also remove individual charts or directories from Groups by selecting the desired item in the bottom pane, and touch  "Remove Chart". Please note that "removing" an item from the Group does not remove it from your "Available" set of charts. The item is simply made unavailable when the Group is in use.

Using your Groups

In this illustration the navigator generally uses the US charts, when available. Coming into Baia do Porto Santo a detailed chart would be great, but no such US chart is available on board. A switch to the UK chart group solves the problem.





Select the Group you want to use, by a right-click context menu item called "Chart Groups". As you switch Groups the logic tries to select a chart and scale that closely matches the situation present before the switch. As you may understand, sometimes the fit is not reasonable, so the resulting view may be surprising.

Finally, if you have no Groups defined, as in the default installation, all installed charts are always available.

Chart Groups and CM93



It is possible to have multiple instances of CM93v2 in different Chart Groups. Above we have 5 instances loaded in various chart groups. The view is of "All Active Charts".
OpenCP also supports multiple partial CM93 datasets.
The instances are loaded, from left to right, in the order of the chart groups.
In this situation, only the leftmost instance of CM93, that is not excluded from the quilt, will be displayed. Above, it is the instance represented by the yellow rectangle.

  Go to Table Of Contents