+1 for honesty.
So far what I have experienced.
In my still short carrier of 5 days, I managed to hit 3 friendlies (darn binoculars) and found out that they overtook me and were sailing in between me and the ship I was firing at. Just some decent money loss and XP is the worst I have noticed for such actions until now. Lucky I do more damage to the enemies, that should keep me safe but it makes me cringe none the less.
Now that I have my first ship with torpedoes, I fear the worst and hope for the best.
Yesterday I was very lucky and prevented what could have been a bad collision between me and a team mate (again darn binoculars). I got those yellow warning signs that I was sailing straight into an island and started steering away. Went into birds eye view and saw an other captain coming straight at me. He was sailing between the island and me (talking about taking risks), nearly flipping me over when we hit each other. Was very afraid that this would sink me. For a few more seconds we where literally brothers in arms, after untangling some cords and such, we went merrily on our way.
I have replay enabled but not yet tested if it actually works.