After a very frustrating journey, I am stuck at the same point as Edo_IF. I have 45 points out of 50. When I "board ship really" , I am told that I didn't find all the geocaches, but I actually did. I was told there were three, I found three and I signed three. The "last lousy point" (actually 5 points) must be something pretty obscure. Can you provide a hint?
EDIT: Forget it. When I checked my notes, I realised that I had been playing the game from scratch and had forgotten to do something obscure on the replay. I now have 50/50.