Navigator's Tools

The role of a ship's navigator is a big one that involves a lot of moving pieces. A navigator must procure detailed maps, map out the voyage of the ship, keep in mind the weather and its effects on the voyage, keeping detailed notes on the journey and be able to deduce the ship's position while out at sea.

Navigator's tools include a sextant, a compass, calipers, a ruler, parchment, ink, and a quill. Proficiency with this kit allows you to add your proficiency bonus to any checks you make for creating or studying maps. The tools weigh 2 lbs and cost 25 gp.

The Navigator's role is for plotting courses, determining your location on the open seas and determining how the weather will affect your voyage. Without a navigator, a ship is more likely to become lost at sea and is unable to prepare itself for the harsh weather that races quickly across the waves.

This is assuming you are using the rules laid out in the Dungeon Master's Guide for D&D 5th Edition, though this can be easily adopted to any travel system. Furthermore, there are more options for Navigators/Quartermasters in the Ghosts of Saltmarsh adventure book or the Of Ships and Seas - Unearthed Arcana.

One of the main jobs that a Navigator is responsible for is ensuring that the captain of the ship is apprised of any foul weather on the horizon and plotting a course to help steer around it. By taking an hour, which can be done during a short rest, the Navigator can study the skies, the ocean currents and take a feel for how the atmosphere feels around them, then they can make a Navigator's Tools (Wisdom) check to determine what the weather will be like for a number of days based off of their result.

Furthermore, they can determine how far out the weather is in the hexes surrounding them. In this chart it is assumed the Hexes are 60 miles wide and is at a Continent Scale, see page 14 in the Dungeon Master's Guide for more information on map sizes.

*Hex size is assumed to be 60 miles wide and on a Continent Scale map.

The weather can be treacherous when sailing across the ocean, and its important to know what is coming. Different types of storms and their effects on your ship can be found on the next page.

At the beginning of each day at sea, you must plot out your course for the day. By spending an hour with your charts and plotting out the direction of your ship, you can ensure that you end up where you are expecting to, even when the weather is trying to throw you off.

The DC for plotting a course depends on where you are in relation to land and whether you are traveling through uncharted territory or have a map, the DC is determined based on your position in the morning though the DM might call for a second check that night if you have significantly changed your location, per the DM's discretion. When you plot your course in the morning, you must roll a Navigator's Tools (Wisdom) check against the DC.

If you become lost while traveling out at sea, you can spend an hour that night determining your location with the help of the stars, if they can be seen. If you are in a bad storm, heavy fog or some other reason you can not see the stars, you are unable to make this check.

You must succeed on a Navigator's Tools (Wisdom) check versus the DC of your location (per the Plotting DC chart above). Upon successfully making the check, you are no longer lost and you can find yourself on the map. You can repeat this check at the end of every day you are lost.

If you are proficient in Survival checks, you can double your proficiency bonus for this check.

While you are plotting out your course, you can gain advantage if someone else is proficient with Navigator's Tools or is proficient with the Cartographer's Tools. If you are proficient in both tools, you can instead double your proficiency to any Navigator's Tools checks for plotting a course so long as you have both tools on you and you have been working on your maps every day.