To take part in Letterboxing you should have with you the following: 

A Waterproof

A good pair of walking boots

A good map of the area (Ordinance Survey)

A note book

A pen

An ink pad (Some pads in the boxes go missing)

A stamp (If you decide to keep up this great hobby)

A compass (For the experts) 

As with any activity it is always a good idea to let someone know where you are going.  You will soon see that finding boxes can be tricky.  It is also very tricky for the Dartmoor Rescue teams to find someone with a broken leg if they don’t know where to start.