Database issues and outdated maps have been a persistent problem for a long time, well before the age of GPS. On the Channel islands, the current maps were developed in 1943 by the Army Corps of Engineers. The topography, some of the earliest done using aerial photos, is still correct today (there are a few exceptions), but the road network and other cultural features are hopelessly outdated. The maps are still workable, but one has to be aware.

Often the old maps, used together with current aerial photos (three cheers for Google Earth!), will work very well. In working with a map, it is worthwhile to check the date of production and consider than when making crucial route decisions.