Log Pose

A Log Pose is a compass-like navigational device, a necessity for traveling the Grand Line.

Paradise
The standard Log Pose is a bracelet with a glass orb sitting on top, and a needle floating inside the middle of that orb suspended from the top by a thin piece of wire.

Normal compasses do not work in the Grand Line due to the special magnetic waves created from each island. The Log Pose functions by recording the magnetic waves of an island in the Grand Line, and points to that island so the user can travel there. Once on an island for the required amount of time, the recording of the magnetic wave resets, and the needle starts pointing toward the next island. The time it takes to lock onto the magnetic waves of the next island varies from island to island.

New World
The standard Log Pose is not suitable for sailing in the New World, due to the fact that some islands change or even completely hide their magnetic fields at random, which may leave a crew stranded if they rely on Log Pose with only a single needle. To navigate safely through the New World, a crew needs to have a Log Pose with three needles. Each needle records the magnetism of one of three different islands simultaneously, as opposed to the Paradise Log Pose, which only records the magnetic waves of one island at a time. The stability of the needle reflects the stability of the island's magnetic field; if the needle is displaying erratic movement, it means that the island's magnetism is unstable.



It is possible to navigate between islands following the change in direction or sensitivity of each needle as opposed to choosing to follow only one, as explained by Charlotte Pudding's map of Totto Land.

The Log Pose can still be affected by the tampering of magnetic waves, as their function was warped within the Seducing Woods.

For unknown reasons, some islands cannot be pinpointed by Log Poses, making them extremely difficult to reach. A notable example is Punk Hazard.

Other Variants
Larger mounted versions of a Log Pose can be found on ships such as the Thousand Sunny, as they have the Paradise version on its helm. Upon reaching the New World, they updated the large Log Pose to the appropriate version.

A variation of the Log Pose is the Eternal Pose, which always points to a specified island.

Log Pose Owners
Many characters throughout the story own a Log Pose, as it is necessary to travel the Grand Line:

Paradise

 * Mr. 9 (Lost, found by Luffy taken by Nami, destroyed)
 * Crocus (given to Nami)
 * Portgas D. Ace (confiscated upon imprisonment)
 * Galdino (discarded or lost)
 * Eddy

New World

 * Minister of the Left (given to Nami)
 * Nami (given by Minister of the Left)
 * Smoker

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