Interplanetary travel

[Figleaf23]

Hello,

I'm working on the space element of my multi-comprehensive omni-setting, in particular, for a near Earth-near future campaign.

I looked in GURPS 4e Space for some practical information on how orbital mechanics is used in relation to interplanetary travel, but as usual, that book was of no assistance. So a couple of questions -- is this kind of information covered in any of the volumes of GURPS Space Ships? or has anyone here got a relatively straightforward method for gaming this element of interplanetary travel?

Thanks for any replies.