As a user of a SR162 i can thouroghly recomend getting your own AIS recieving equipment.
I currently as many others do share my data from my location to Ship Plotter COOA server so others can view my data if they have a registered copt of the software.
Ialso share my data to a free website call AIS Liverpool which provides good coverage of the UK. (live to public)
In regards to Worldwide your a bit limited, there is:
SiiTech Web Vts Web that has some coverage in Canada and the world (live to public)
Vessel Tracker which has some coverage in Europe. (delayed 1 hour for free account)
AIS Live some world coverage on paid version , free mostly Europe and very expensive for live coverage (free to public available but least one hour delay on free, limit to areas shown, no search ability etc)
AIS Live must be in bed with the goverment to restrict it's use so much and it's cost.