On Tue, 19 Dec 2006 13:09:21 GMT, "Dennis Pogson"
wrote:

Oziexplorer has such a facility. It is shown as the "index map".

Maptech Off Shore Navigator (OSN) also. It has a world map that can
optionally show all of your chart outlines in yellow rectangles. It
is very useful for zooming from one region to another.