|While using it, the player enters in a minigame and has to locate 4 stars in the sky (minimum, to maximum 11) to get a buff that adds to your HUD a semi-transparent minimap with a center arrow pointing your facing direction, a highly-accurate top-of-screen compass and a bottom-of-screen readout of your current region, GPS coordinates, speed in knots to two decimal points and precise direction of ship travel in degrees. Duration: 5 minutes (minimum) to 2 hours (maximum and with Advanced Cosmology skill). Cooldown: None (can reapply immediately after it runs out).|
HUD text: "Enhanced exploration skills and infinite flotsam visibility." But that doesn't do this miracle device justice. It provides you the little extra data you need to be a truly-exceptional sea captain and land explorer.
Obtaining a sextant and learning to acquire a maximum-length sextant buff with it, day or night, will likely save you from the loss of many of your ships at sea and decrease the time it takes you to search a land area for needed resources. Any serious sea captain running a full-crewed galleon, including a crew pilot at the wheel, can maximize his situational awareness and hit literally any compass heading he wants by setting the white diamond on the sextant top-of-screen HUD compass to the heart of his best navigation corridor compass heading and issuing the command Autopilot / "Set Heading: (My facing direction)".
This allows you to make cross-world voyages following the most direct course possible for as much time as possible. How? By allowing you to recover from necessary escape or combat maneuvers to avoid or attack dangerous Ships of the Damned or duck between cyclones and then return to your ideal heading with just a glance at the top of the screen and a pivot of your wrist, then a simple command.
Important note: while a sextant and a pilot are great navigating the deep sea, a wise captain sets them aside when in shallows and when docking or dropping anchor.