Found some info on Portland Harbour for the next week or so:
http://www.dorsetforyou.com/media.jsp?mediaid=173560&filetype=pdf
Particularly:
"KAYAKS
Q. Can I launch my Kayak or Canoe in the Paralympic waters during the Paralympic Period?
A. Yes you can. During Race Hours (R) you should remain within the defined areas in Portland Harbour. If
you wish to go through the Portland Marina Gate you will need to register with Portland Harbour Authority
and book an Olympic Sticker (min 24 hr. notice). After Race Hours (R) the Competition and Course Areas
will be opened for general use."
"FISHING
Q. Can I fish in in Portland Harbour during the Paralympic Games?
A. During Race Hours (R) fishing by rod and line from a boat can take place in any area that is not the
Competition Area and is clear of normal prohibited or restricted areas. Once the Competition and Course
Areas are released daily for general use then fishing may take place in all areas not prohibited or restricted;
these areas are on current Fishing Permits in force for 2012.
Commercial fishermen have restrictions during the Paralympic period and these restrictions have been
agreed by prior arrangement.
DIVING
Q. Can I dive in Portland Harbour during the Paralympic Games?
A. Yes but not in prohibited or restricted areas as shown on current Portland Diving Permits for 2012.
Additionally, during Race hours (R) diving cannot take place in the Competition or Course Areas. After
race hours (R) these areas will be reopened for general use. The Olympic Marina will be closed to divers
throughout the Olympic HRO period (H)."
I assume though that by diving they mean SCUBA. I guess 'snorkelling' is simply swimming with props?