I feel for you, but that's just an obnoxious GM. My GM gets us orbital maps, details of the relevant hive sections (if not of all the buildings making up that section), and likely enemy strengths. And while we don't always get to choose our insertion points (we usually do), we always get some time to plan before climbing in the thunderhawk/droppod/boarding torpeedo. For us it usually goes mission briefing - planning session - requisition - deployment. And ever since I read the Universal Brotherhood file (Shadowrun), if they are available, my characters always bring recording devices.