request for a URL that would present the base map in a specific area/zoom. Any maps allied to the area then chosen manually by the surfer.
see http://osgr.mister.red - I will add links to any useful website where targetted URLs can be generated from OSGR/LatLong. (or from selected website URLs with implied geo data).
Thank you for your idea. Unfortunately, we are not planning to implement it in the near future.
The OldMapsOnline Search has #bbox query in URL - so you can specify LatLong of interest while linking to the web.
The Georeferencer Compare tool has the permalink functionality - which let you share a link to a defined view on a map (or multiple maps) into an exact geographical location.