How much do you get penalized for refusing BDU's orders?

[Paul Riley]

I have just been assigned a rather ridiculous patrol in grid GR89,and as you know that is about as far down the bloody world as you can get,with no activity down there whatsoever!I thought to myself this cant be right,and I'm not gonna go all that way down there to find nothing,so,what I have decided to do is cut my assigned patrol down a bit and make sail for F.Town instead,and intercept shipping in that area,which is enroute in any case.
Why on earth would BDU send a boat all the way down there in 1942?,its not like they are desperate yet to make even the slightest impact on allied shipping is it?.
Now,i've never refused an assigned patrol yet,so by refusing how much will I get penalized for this transgretion,and will there be any further serious action taken?I imagine in real life there may have been a court martial for this,or worse
What I plan to do is sink as much as I can and earn as much renown as possible,to try and counter the penalty.