There's a map in a post yesterday evening.
He was confirmed as having reached Pedi from St Nicks and looks in good shape (moving well, no signs of stress on CCTV)
The maps shows there are THREE paths between Pedi and Simi - one is the road, which would be a hard hot slog (reflected heat, risks of traffic incident) but a place where he would easily be found as long as he didn't randomly wander off it (symptoms of heatstroke include confusion, disorientation and even hallucination, so we cannot rule out erratic decisions).
The other two paths are much harder terrain, easier to lose your way, and the longer one (which, from the description of where a witness last say him. may be the one he chose).
We don't know how much searching they have done of that path (eg by drone) and now it's light, they say they will be back in that area. But that's two trails in difficult terrain that they need to cover thoroughly. Not easy, even if additional specialists have now arrived on the island. And of course, they'll have to go at snails pace to avoid becoming heat casualties themselves (forecast remaining high 30s? Above body temperature - hugely hazardous)
I think the chances for his survival, without water, after this amount of time are now very low. But I'm still hoping