Well I found one example of direction near the end of the book. It may not be the one Trillian intended because direction is a fairly common word - but here goes.
It's been a while since we saw Zaphod, Ford and Trillian and for the life of me I don't remember why they are where they are. I don't feel like going back to re-read again so here is the passage:
"...Zaphod was standing and scanning the horizon, because that was how far the gold ground stretched in every direction. perfectly smooth and solid. It gleamed like ... it's impossible to say what it gleamed like because nothing in the Universe gleams in quite the same way a planet made of solid gold does."
Apparently the planet is only an entry in the catalogue of planets the Magoratheans can make and is on "Sens-O-Tape."
Some of these words are quite difficult to depict! Obviously I was too lazy to draw a map. Instead I chose a picture of one of those GPS finders you put in your car. I really need one of these because I've always said I can get lost in my backyard.
Now how to quill direction? I need first to show you a picture of what I was trying to make - a signpost showing different directions:
And here is my rather lame attempt:
Looks a bit like those twirler things you use in some board games, but it does have the cardinal directions, north, east, west and south.
Hope everyone has a good week.