Is the trap supposed to be near the Franklin, though? Jaylah probably ranges far and wide in her search for spare parts. And the Enterprise crashed right where Jaylah would be expecting people from Krall's quarry to be approaching from...
The distances aren't particularly great in this map, even if the terrain is difficult to traverse. Which incidentally makes one wonder why the saucer crashed at this exact spot. I mean, the rest isn't coincidental: the quarry is probably where the Franklin landed for a reason, and the supposed dozens of other crashed ships aren't in this immediate vicinity from what we gather in the movie or what this map shows. And the assorted Enterprise evacuees might have been steered towards one and the same spot by automatic emergency protocols, so that all evacuees would meet where the saucer landed. But why does the saucer go where it does?
It's not as if the heroes would have spotted anything of great interest in that spot, either - the whole planet sported those "vast subterranean elements". Are we supposed to assume Krall's forces gained such total control of the saucer that they were able to steer it to Krall's lair?
Timo Saloniemi