One Direction Radio 4, 9.30am

Author and cartographer Jerry

Brotton (right) explores the four cardinal points of the compass.

He begins by considering the possibility that, in the digital age of Google Maps, there is no cardinal direction at all and that N, E, S and W have been made redundant.

The last edition of The Caretakers (Radio 4, 11.30am) hears from Jackie, Andy and June as they work on the upkeep of Titanic Belfast, the Yorkshire Sculpture Park and the Middlesbrough Institute of Modern Art.

In Free Thinking (Radio 3, 10pm) researcher and performer Naomi Paxton honours World Heritage Day by looking at a series of UK archives.