Hi Phyll - Thanks for your kind feedback about the site.
We don't have a facility for off-line maps yet I'm afraid. You could try looking into mobile navigation apps that do this - some of these have offline maps and accept route files in GPX or TCX formats that you can export from plotaroute.
Hi. Have discovered your amazing site and am so impressed! Thank you. I don't have lots of data allowance on my phone and don't have a gamin device. Wondered if it's possible to use a saved route off line?