You may find it useful and interesting to download the Help and Information Guides to GOM - the Global Overlay Mapper, or NAOMI - the North American Overlay Mapper. This will allow you to explore the many features offline. The Help and Information Guides are completely self-contained packages. Once you have downloaded one or both of them, un-zip the files into an empty folder for each guide, then click on 'index.html' to launch the guide.

To download the Help and Information Guides, click on the links below:

GOM - the Global Overlay Mapper

NAOMI - the North American Overlay Mapper