Hi Greg:
From strictly a technical point of view, loading WorldMap will give you a display when you zoom out to wide views. But, I don't think that is a good idea anymore (in 2005), because WorldMap is so old now. There is a pretty good probability that the information that WorldMap displays will actually be inaccurate and misleading (in Europe and the USA) - in other words, it won't show major roads that now exist, and you will see significant changes (disconnects) when the display switches over from the CN, CS or MG detail maps to WorldMap.
Better, I think, to just use a paper map for the wide views - less chance of seeing inaccurate information being presented.
WorldMap was brought out in the mid 1990s for a very specific purpose, and that was to provide a very general cultural overlay on the first handheld GPSRs that were available around 1995 or so. Since 2002, just about any GPSR that is sold has came with a basemap in it - so, WorldMap is now not much more than a historical curiosity. If it were up to date, then I would install it. But, it's way out of date, and if it is installed in an automotive GPSR today, there is the risk of doing more harm than good - i.e. creating confusion with out of date information.
Michael