The simplest views in HLAmap are probably 'Modern' (bringing together the land use types that have been introduced since the 17th century) and 'Past' (those that are medieval and earlier in date). Click on 'Dual Map View' and you can choose to compare the two, with Modern in the Primary View and Past in the Secondary View or vice versa. HLAmap is so versatile that comparison can be made between any two chosen views from 'By Period of Origin' or 'By Land Use'.
There is also an option to view 'By Use'. This choice optimises the HLA data for a specific purpose, such as informing the initial stages of enquiry regarding land use change, perhaps for a forestry plan. Further guidance on these uses can be viewed in 'Case Studies' on this website, or downloaded as a pdf.
In addition, as long as the map is at 1:27,000 or less, you can introduce layers from Historic Environment Scotland (Listed Buildings and Scheduled Monuments) and site records from Canmore by activating the 'Additional Layers Menu'. This is very useful, as small historic or archaeological sites are not included in HLAmap as they are too little to show at a scale of 1:25,000. Areas less than one hectare in extent (100m by 100m) are not only impractical to map, they don't affect the over-arching land use of an area.
The data in the overlays can be interrogated to reveal the type and period of a site as well as any associated information that is recorded in the national database Canmore or held by Historic Environment Scotland.Additional site data is held by local authorities in their Historic Environment Records and they need to be consulted for further information. Aspects of their records can be viewed using PastMap [ pastmap.org.uk ].