Graham_Wright
Well-known member
On a recent RYA approved course, I learned a few things that I took issue with (e.g. the tides are caused by the magnetic attraction between the moon and the earth's oceans).
I also learned that special marks, i.e. those coloured yellow and generally with a cross top mark indicating a variety of items of interest, indicated also the depth of water beneath them according to their shape and size.
I have found no reference to this claimed relationship.
Can anyone verify or contradict?
I also learned that special marks, i.e. those coloured yellow and generally with a cross top mark indicating a variety of items of interest, indicated also the depth of water beneath them according to their shape and size.
I have found no reference to this claimed relationship.
Can anyone verify or contradict?