Karaka's eyes and Karaka's helmet

The reason Karaka was able to find Bong Bong
(as it will be revealed next chapter) is because Evan's items' effects were turned off when Kranos was ignited.
And a Ranker like Karaka usually has eyes of an observer.
Very different from Baam's intuition, very trained, physically trained mental ability.
(And Karaka's originally a Scout-Fisherman hybrid, and has a helmet with Observer-like functions.)
In fact, it's amazing that Evan's items were good enough to hide from Karaka so long.

Vol.2 Ch.224: 39F - Hell Train: The 'Name Hunt' Station (27) Blogpost