View Single Post
Old 06-20-2022, 09:59 PM   #2
thrash
 
thrash's Avatar
 
Join Date: Aug 2004
Location: traveller
Default Re: Far Trader, First In, and the Ice-Capped (Ic) trade class

The Ic trade classification is a holdover from the classic Traveller trade system (Book 7, pp. 36, 40). Under Book 3 rules, it is possible to have Atm 1- and Hyd 1+, which is the original definition. The Ic class is a fudge to explain why a world can have a "hydrographic" score without the atmosphere to retain liquid oceans. The trade class is there for anyone using world data generated under Book 3 or one of its derivatives, rather than the more scientifically accurate version in First In.

I would say that any icy rockball world or moon would count. Earthlike worlds in a snowball state technically wouldn't count unless the atmospheric pressure is very low. Desert worlds shouldn't have more than 5% hydrographic coverage, by definition -- the original classification doesn't overlap with ice-capped at all.
thrash is online now   Reply With Quote