There was a portable GPS beacon you could rent for a week for $60 or so, and I did look into it a bit before the trip, but in the end decided not to rent one. I figured that I most probably wouldn't need it. I'm generally pretty good with my compass and map though and the 2 trails I was walking were well marked and maintained.. so no problem, right? I just got confused a bit eventually when the hike was taking what I thought was way too long, with none of the expected geographical features in sight... and the trail markers don't tell you which trail you're on. I don't even remember now why that waterfall, which was clearly marked, didn't help. Maybe my map was crap. I was using a small one from the pamphlet. I figured I was probably heading the right way, but if I wasn't.. there would be a hut eventually. And I wouldn't have a ticket for a hut I didn't book, but they would accommodate me, assuming there was room. If not, it wouldn't be the end of the world. It's New Zealand, they wouldn't let me die. The ranger at the hut would figure out what to do! The stupid sun, painkillers, and my general tiredness made the situation a lot more worrysome than it probably had to be.