I do not quite follow your argumentation. Perhaps I just do not get your message... 
But I think it is right to have two tug marks above each other of which one mark is submerged when the ship is loaded. The spots mark a reinforced area of the hull constructed to withstand the forces of a tug. Why do they have to be placed within the freeboard? If the ship is in ballast the marks would be high over the waterline (which in this case is way below the max draft marks) and the tug marks would not be useful. This is why there is another set of tugmarks below the marks designed for the fully loaded ship and this is exactly what LucAtC's photo shows.
Regards
groennegaard
Hello groennegaard,
well I don't want to stuck to long on this, but I will show you a picture of a vessel like the one I was sailing on:
As you can see next to the name - on the right side of this - there is a arrow showing down with the letters "TUG". These tugspots show you were the AREA is, so in this case just down the line of the arrow. You are right when you say that the part of the hull is reinforced at this point but it is also where the tugs can efficiently push to receive the best movement solution.
In conclusion we both are right, that these points show the cpt. of the tug where to push, but he don't have to push exactly at this point, it's a vertical line and the ship is not in only in two conditions - loaded and in ballast. Imagine the vessel had just lightered and 50 % left when it reaches the next terminal, than the tug pilot has to push between the two point on the virtuel line.
Obviously, nevermind .. I hope I could answer your 'question' groennegaard ;-)
Otherwise send me a msg.
________________________________________
I agree with you groennegaard, I'm also interested in animated propellers etc.
Furthermore I guess it is very hard and intensive in programming time but the two different conditions of a vessel own completly seperate manouvering habits. But in the first step I agree only to use the fully loaded condition.
mfg blackbat
