There are simple search instructions on the previous page. If you can't find what you need or are getting too many results and want to narrow down your search then the Advanced Search is useful.
The Advanced Search for maps can be found here. It gives you more search options - Place is the area covered by the map, and Subject is for maps showing a particular subject (such as geology, railways or population).
You can keep adding lines to refine your search:
If you don't know what scale maps are available and want to find out, you can search by place and narrow down your results using the Map Scale facet. This comes quite far down the list of facets, on the left hand side of the screen under "Sort and filter results." It is available on both the general search and specialist Map Search screens.
One important thing is that detailed maps of a specific area are very often part of a series covering the whole country, which will be catalogued under the name of the country. For example, for the OS Landranger maps of Great Britain, there is a single record on SOLO for the whole set, under Great Britain. You can use this record to order the sheet you want. So it's best to try searching by the name of the country, as well as by your particular area of interest. You may need to look at a graphic index to locate the sheet you want within the series. If you need help, contact the Bodleian Map Room.
You can search by Publication Date to find maps of a particular period - use the ? symbol for truncation to limit your search to maps of a particular decade. Here's how to search for maps of London from the 1660s:
Using 16** in the same search would find maps of London from any time in the seventeenth century (you have to use * rather than ? if you are replacing more than one character). Searching by date will find both facsimile and original maps from the period specified - so if we have a modern copy of a 1660 map, you would find that as well as an original.
Early maps were often printed in atlases and are not always catalogued individually; there is more likely to be a single record for the whole atlas. Please consult Bodleian Map Room staff for more help with this.