Question

how do sub- directions help us?

Answer 1

Answer:

The intermediary directions like north-west, north-east, south-west and south-east also help to find places more easily. These directions help to locate places that may be located in the interiors and are otherwise not easy to locate.

Answer 2

$\huge\color{red} Answer$

hii...!

sub directions, or INTERMEDIATE DIRECTIONS are pretty useful than normal, i.e. cardinal directions... they locate the more acurate place...!