I find it easier to use mapping/ OS websites when at home rather than a paper OS map. Ive used these sites for many years although im not a keen walker.
It could be useful to avoid the "get of my land farmer ! "
or looking for historical routes i.e metal detecting.
Can be handy for finding "public open space plots" included in new developments and make use of them before sombody reclaims them as private etc
Im hoping that people might add useful mapping sites, tools and apps to the comments.
Im not a particularly hands on person on threads but the information may be usual to others.