Not a rules question... just a prompt for conversation. I'm interested in hearing about how failed Astrogation checks have turned into fun and/or unexpected experiences in your games.
We have tended to mostly ignore the skill, assuming that the PCs get wherever they were supposed to so that the planned adventure can take place. However, we recently had a pretty cool detour. The planned adventure was to take place entirely aboard the ship, dealing with a stowaway and some inter-PC conversations that needed to happen on the way back from an adventure to our homebase. On a lark, we decided to do the Astrogation check for getting home. The result was failure with threat. Rather than just saying it took longer than we expected or calling for a second roll, we took a look at the galaxy map to see what was near our intended destination and picked Smuggler's Run as sounding interesting. A quick skim of Wookieepedia later, we were dodging asteroids (while dealing with the stowaway) and setting down on a skip in the hopes of being able to buy some updated Astrogation charts. That purchase could have been handled with a single Negotiation or Streetwise check, but since we were exploring a new place, it turned into a whole adventure of its own. We repaired a busted-up old bartender droid so that it would tell us where we could get charts. It referred us to a den of astromechs hanging out in the maintenance and sewer corridors below the buildings. We had to persuade them to sell us charts, and one that knew the sectors we cared about insisted we take it along with us in exchange for its help with the jump. On the way back through the sewer level there was a dianoga attack (of course). Finally, we had to deal with getting the astromech past spaceport personnel, since it was wanted. And paying off someone who recognized us to keep quiet about having seen us at Smuggler's Run (due to some Bounty obligations).
A lot of the direction of the spur-of-the-moment adventure came from Triumphs and Despairs or advantages and threats rolled along the way. It made me really appreciate again the narrative dice and the ideas they help solicit.