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Classic Traveller Discussion on the granddaddy of them all, Classic Traveller!

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Old January 1st, 2018, 10:54 AM
punga punga is offline
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Default Hydrographic Percentage of a Planet

Hello, all! I've slowly been dipping my feet into other versions of Traveller after playing GT some time ago. While working on a subsector, I hit the following snag:

The rules for world creation in CT (and MT) specify that to determine the hydrographic percentage of a planet, one rolls 2D6-7 + size; if the planet's size is 0 (or 1, in MT), the hydrographic percentage is automatically 0. If the planet's atmosphere is 0,1,A,B, or C, one add a DM of -4 (so the roll is really 2D6-11). This means that there's non-trivial chance of rolling a negative number, which of course is rather odd to me. Am I missing something in the rules? Perhaps I'm misreading the dice notation?

Thanks in advance.g
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