The attachment contains the text of Chapter 2 of the 4th Edition including some initial edits made by Chris Rizos. Where necessary pictures and diagrams have been removed in order to meet the file size limitations on this discussion forum web-site. The diagrams can be consulted in the pdf version available at http://www.iho.int/iho_pubs/CB/S-51_Ed4-EN.pdf
I can supply the word files with diagrams to individuals as required.
I attach a further draft of this Chapter porepared by Sunil. The pictures have been removed in order to meet file size restrictions. If you want the file with pictures please contact me and I will email it to you.