Hello Karamzovnew,
hey thanks a lot !!
Just downloaded your document, a "short" 30+ pages report done in a few hours eh ?
When you wrote (not literally) that the
bow and
stern has to pass the mark, and not the beginning of the pixels i suddenly realized what was wrong and felt like an idiot lol there went my speed calculations

Will still have to read it all, and make some parallel practising.
Hope all goes well with yor exams, i wish you luck
Thanks and greetings,
Catfish