The first half of the Grand Line did not have a special magnetic field like the New World. Routes between islands required a Log Pose or Vivre Card to indicate the way.
The currents and climate in the first half of the Grand Line were regular. As long as they determined the location of the Boin Archipelago, they could arrive safely by following a compass and sea chart.
After half a month of sailing, Garp's Dog-head Warship finally reached the Boin Archipelago.
Mid-October.
It should have been late autumn, with cool breezes blowing, but when the warship entered the waters around the Boin Archipelago, the temperature noticeably began rising rapidly.
By the time the warship reached the easternmost island of the Boin Archipelago, the Marines aboard had already changed out of their autumn uniforms and into their summer Marine uniforms.
"This weather is really bizarre!"
"I never expected a place like this to exist in the first half of the Grand Line. How the hell did Zephyr find it?"
"Ho! This archipelago is strange!"
It was Garp's first time visiting the Boin Archipelago. The Dog-head Warship docked by the shore, and Garp accompanied Tsugikuni Yoriichi onto the island.
The moment he set foot on the island, Garp felt something strange, as if some savage beast had fixed its eyes on him!
Garp's Observation Haki swiftly spread out. In the blink of an eye, it enveloped the entire island, and a look of surprise appeared on his face.
"So that's how it is!!!"
Garp's Observation Haki covered an extremely wide area. In just a few seconds, he had already seen through the true nature of the island beneath his feet.
This entire island was a "creature"!
Just as the Marines aboard the warship were preparing to disembark, Garp decisively shouted, "Don't