The description is garbage and the starting point for the Ruby code is extremely un-idiomatic. Worst kata I have encountered.

Start by fixing the description. Look at other katas to see what a good description looks like.

This kata slew me. Hot damn.

A more idiomatic version of the same would be to use a Set in place of a Hash, as you are not actually doing anything with the values of the hash.

You did sidestep the problem with my solution - by using i1 = i - 1 instead of i1 = i, you avoid having to do floating point maths, which I'm pretty sure slows my solution down a fair bit.

Enterprise FizzBuzz ain't got nothing on this

A dictionary of codes is provided, no need to reimplement.

The specification is awfully lacking. Nowhere does it mention anything about what sort of data to expect, or what to do with punctuation.

Surely this can't be a correct solution?

(3..10) === walk.count

This only checks whether walk has between 3 and 10 elements.

walk.join.count('nw') == walk.join.count('se')

This will incorrectly return true for %w(n s s s s e w w w w), even though such a route leaves you 3 blocks South and 3 blocks West of where you started.