Log Pose

A Log Pose is a specialized type of compass, a necessity for navigating the Grand Line (where the unique minerals in every island produce atypical magnetic fields that render ordinary compasses useless).

Overview
The standard Log Pose consists of a glass orb, with a directional needle inside suspended by a thin piece of wire. In most cases, the devices are mounted on bracelets that can be worn like wristwatches.

Unlike conventional compasses, the Log Pose does not affix to a single direction; instead, it "records" the magnetic field between a given island and the next-closest, and points to the latter after a select amount of time. By keeping course with the needle, any vessel can pass from island to island in the ultimate direction of Laugh Tale.

(The magnetic "routes" created by Log Poses are strictly one-way, and cannot be used to return to a previous island. According to Crocus, seven such routes emerge from Reverse Mountain, but gradually merge into one over the distance to Laugh Tale.)

The time it takes for a Log Pose to fully "record" any given field varies sharply between islands, it could require hours, days, or even years. Despite this, most experienced sailors will doggedly trust Log Poses over virtually any other navigational means, which stand little chance against the Grand Line's infamously bizarre climate.

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 a 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. There are no guarantees, but as a rule of thumb, this likely means that there is something dangerous on the island causing the disturbance in its magnetic field, as changes in magnetism can be caused by abnormalities on the islands in the New World.



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. Notable examples include Punk Hazard and Laugh Tale.

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
 * Zenny (given by the Straw Hat Pirates)
 * Golden Lion Pirates

New World

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

Translation and Dub Issues
The 4Kids-dubbed anime (as well as video games) renamed the Log Pose and Eternal Pose to Grand Compass and Eternal Compass, respectively. While this renaming was kept by the Funimation-dubbed anime's initial TV cut, both the uncut Funimation anime and the VIZ Manga use the original terms.

In addition, to fit story changes that truncated the Reverse Mountain Arc to remove Laboon and Crocus, and completely eliminated the Little Garden Arc, the 4Kids anime extensively rewrote the context behind the Poses the Straw Hat Pirates acquire during the Arabasta Saga:
 * The crew's first "Grand Compass" (originally taken from Mr. 9) is depicted as an item that Yasopp deliberately left Usopp. Several of the Straw Hats recognize it on sight, and its workings are explained by Sanji, relaying experience from Zeff.
 * As the crew never drops anchor at Twin Cape, this compass is never broken, and Crocus' substitute is not needed.
 * The quickly-broken "Eternal Compass" that Robin gives the crew at Whisky Peak is said to lead directly to Arabasta, rather than Nanimonai Island.
 * The compass ultimately used to reach Arabasta (originally taken from Mr. 3's base on Little Garden) is depicted as a spare that Igaram gave to Vivi, which was "forgotten" until Luffy broke Robin's.

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