[Star Wars] Astrogation

[Wildcat]

Just off the top of my head, I would place Astrogation as a Very Hard skill with no default. Minimum equipment for astrogation would be an astromech droid, which I would say would have you rolling at -2 to skill, unless it was an especially good astromech droid. An on-board astrogation computer (rare on even the biggest fighters, but common on everything bigger) would allow you to roll at full skill. There could conceivably be high-quality computers that might give as much as +2 to skill.

Updating your database frequently is important to keeping everything safe. After a week without updating your computer, you're at -1; after a month, -2; six months, -3; a year or more, -5.

I couldn't say about questions 2 and 3.