1- I think he needs something to light a fire, something to hunt such as a gun and something to orientate.

Comprehension.

1- He still needs ink paper and a pen, mathematical instruments and Bibles.

2- The lack of them causes the loss of rationality and the loss of the track of time.

3- To solve this problem he cuts a notch every day with his knife upon a large piece of wood, thus he keeps his calendar.

4- He needs someone to talk to.

Interpretation.

1- The large number of details are unusual, as example the date and the latitude. This details are added to convey the idea of realism.

2- the beginning is similar to this extract becuase both of them have a lot of details, such as dates and scientific references to places.