Serial Set maps are only searchable through the Advanced Search page, and the Search by Number lookup for Serial Set volumes.
If you select only the Serial Set Maps in the Documents Types menu on the left column on the page and you can see exactly which fields are searchable.
Click on the link to Find Terms (far right in image) to see the indexes you can use for maps.
First make sure the correct tab has been selected (Serial Set Map Terms). There are 4 different indexes, shown in the upper left corner, available for the maps.
Then you can search using the hierarchy provided, or use the option to find a term using the box that is right. The pulldown allows users to search for a term containing, or starting with, a particular word, phrase, mapmaker, geographic area, etc.
The left column shows the information included in the record, and allows users to jump to relevant information.
The top part of the Map Info section gives details on the map, while the bottom part (starting with Serial Set ID) gives information about the report the map is contained in.
The Content Notation gives an overview of the map.
The Map Details section gives an overview of the physical details of the map - number of sheets, scale of the map, map size etc.
The Terms section includes the indexing information for the map.
Finally, the Map File allows the user to open the map in the viewer, or download in JP2 format.
Once you have clicked on the link in the maps record you can see the map.
Use the Zoom Level (indicated in the left circle) to zoom in to see specific details on the map.
This map is shown at about 21 percent, so the box in the upper left corner shows the portion of the map detailed in the main display.
You can drag the box in the upper left around the map to see different areas, as well as clicking on the big map to re-center the image. And of course, you can zoom in and out.
Using the options along the top, you can turn the map, resize it, and more. Each of the buttons has a mouseover explaining what it does.