On the other hand the u-boats did sink a remarkable number of neutral - and friendly - ships that they could see plain as day! I recently posted on the SH3 boards an account of a u-boat sinking an Italian fishing trawler, questioning the survivors and refusing to believe they were Italians! Seems they were outside the prescribed 'friendly' area.
But I agree: shooting blind is a bad idea if you value your reputation; i.e. renown.
