Hydrosphere

The Hydrosphere represents (Hydrographics) or the liquid content of a world, usually water on a conventional life-supporting world.

Description (Specifications)

Worlds with vacuum atmosphere may have hydrographic percentages greater than 0 indicating that the world has ice caps present; the water will not be freestanding liquid but frozen solid mass on some or all of the surface.

A Desert World may have up to 5% free-standing water and still be considered a Desert World. Conversely, a Water World may have a 96% hydrosphere and still be considered a Water World.

On worlds with exotic, corrosive, or insidious atmospheres, the liquid may be composed of chemicals other than water, like ammonia, methane, ethanol, or other more exotic compounds.

Hydrographic Code Table

Hydrographic Codes
Symbol	Code	Description	% Surface Water	Remarks
	0	Desert World	0 - 5	It is a super arid (anhydrous) environment.
	1	Dry World	6 - 15	It is an arid (near anhydrous) environment.
	2	Dry World	16 - 25	It is a standard (wet) environment.
	3	Wet World	26 - 35	It is a normative (wet) environment.
	4	Wet World	36 - 45	It is a normative (wet) environment.
	5	Average Wet World	46 - 55	It is a normative (wet) environment.
	6	Wet World	56 - 65	It is a normative (wet) environment.
	7	Wet World	66 - 75	It is a normative (wet) environment.
	8	Very Wet World	76 - 85	It is a standard (wet) environment.
	9	Very Wet World	86 - 95	It is a marine (near superhydrous) environment.
	A	Water World	96 - 100	It is a supermarine (superhydrous) environment.

See also

Universal world profile

§ == ( Please refer to the following AAB Library Data for more information: ) == §

• Main world
• Hex Number
• Universal World Profile
  • Starport (Sp)
  • Planetary Size (S)
  • Atmosphere (A)
  • Hydrosphere (H)
  • Population (P)
  • Government (G)
  • Law Level (L)
  • Tech Level (TL)
• Trade classification & Sophont Codes
• Importance Extension (Ix)
• Economic Extension (Ex)
• Cultural Extension (Cx)
• Nobility
• Bases
• Travel Zone
• PBG - Population, Belts, Giants
  • P: Population Multiplier
  • B: Belts
  • G: Gas Giants
• Worlds
• Allegiance Code
• Stellar Data
• COG Sequence
  • C: Climate
  • O: Orbit
  • G: Gravity

References & Contributors (Sources)

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Worlds and Adventures (Game Designers Workshop, 1977), 4, 6.
• Joe Fugate. Grand Survey (Digest Group Publications, 1986), 19.
• Marc Miller. Referee's Manual (Game Designers Workshop, 1987), 22.
• Geir Lanesskog. World Builder's Handbook (Mongoose Publishing, 2023), 69-71.Joe Fugate, J. Andrew Keith, Gary L. Thomas. World Builder's Handbook (Digest Group Publications, 1989), 69-71.
• Frank Chadwick, Dave Nilsen. Traveller: The New Era (Game Designers Workshop, 1993), 186.
• Marc Miller. Marc Miller's Traveller (Imperium Games, 1996), 133.
• Loren Wiseman. GURPS Traveller Core Rules (Steve Jackson Games, 1998), 123.
• Jon F. Zeigler. First In (Steve Jackson Games, 1999), 71.
• Martin Dougherty, Hunter Gordon. The Traveller's Handbook (QuikLink Interactive, 2002), 376.
• Gareth Hanrahan. Core Rulebook (Mongoose Publishing, 2008), .
• Matthew Sprange. Core Rule Book (Mongoose Publishing, 2016), 218-219.
• Contributor: Lord (Marquis) and Master of Sophontology Maksim-Smelchak of the Ministry of Science