When I was in flying school, we had a fiendishly difficult navigation examination with a known curmudgeon of a CFI (Chief Flying Instructor). Almost everyone i

When I was in flying school, we had a fiendishly difficult navigation examination with a known curmudgeon of a CFI (Chief Flying Instructor). Almost everyone in the class failed. One student got 68% and myself and another got 99.9% I was amazed as I am not often such a high scoring student, so I cheekily asked where I had lost the 0.1%? The CFI told me that I had copied one number down incorrectly from the question sheet onto the first line of my (4 page) working sheet. I had got the "right" answer at the end though, by following all steps of the spherical trigonometry through to the end. Instead of marking me as a 'fail' for getting the wrong copybook answer, he still deemed it correct because I had followed all the correct formulae and logical steps, using the derived results in the next sections. He deducted 0.1% for the brain fart that transposed one starting value. I didn't find out why the other guy lost 0.1%, but I was amazed at his integrity to mark the work and knowledge and not just see the final value different from the desired outcome and simply marking it wrong. It would have taken him some time and effort to validate my results from my wrong initial values.