I note that you cannot add non-US clubs to your profile.
If you added the Country field to the location then you could pick from the database for those who choose USA as the country and allow free format to populate the database for the others – although this is likely to end up with duplicates.
The UK has a list here http://www.rya.org.uk/wheresmynearest/Pages/directory.aspx#list/t-1
New Zealand has a list here http://www.yachtingnz.org.nz/clubs/club-directory
Yachting Australia doesn’t seem to have a list on their club finder but you could contact them to get the data – yachting.org.au