determining exhaustion. Swimming for an hour at a
depth greater than 200 feet counts as 4 hours.
NDERWATER VISIBILITY
\'isibility underwater depends on water clarity and the
available light. Unless the characters have light sources,
use the Underwater Encounter Distance table to
determine the distance at which characters underwater
become aware of a possible encounter.
UNDERWATER ENCOUNTER DISTANCE
Creature Size
Clear water, bright light
Clear water, dim light
Murky water or no lightEncounter Distance
60ft.
30ft.
10ft.THE SEA
Characters can row a boat for 8 hours per day, or can
row longer at the risk of exhaustion (as per the rules for
a forced march in chapter 8 of the Player's Handbook). A
fully crewed sailing vessel can sail all day, assuming its
sailors work in shifts.NAVIGATION
Seagoing vessels stay close to shore when they can,
because navigation is easier when landmarks are
visible. As long as a ship is within sight of land, there
is no chance of the vessel becoming lost. Otherwise, a
ship's navigator must rely on dead reckoning (tracking 00