More of Igor Sterzhantov’s images can be found here https://web0477.myportfolio.com/
The Cruising Association, of which John Bryden and Lisbeth Refsgaard are members, has a Baltic Section which has very useful meetings, webpages, newsletter etc. Run by Graham and Fay Cattell.
The CA also has a Blue Water Cruising Section run by Sandy and Brian Duker. This also has many useful meetings, a newsletter, and links.
The CA has discount arrangements with many suppliers etc. in different countries, and some reasonably priced cabins at its’ HQ on Limehouse Basin, London.
The Swedish Cruising Association of which John Bryden and Karen Refsgaard are members has similar goals and activities to those of the Cruising Association, and produces useful publications as well as having interesting meetings. It also has a number of harbours and buoys for members. See https://www.sxk.se/welcome-swedish-cruising-association
RYA, Royal Yachting Association, which John Bryden is a member of
Hallberg-Rassy Owners Association (UK)
John Bryden and Karen Refsgaard are members.
SSRS. The Swedish (Marine) Rescue Association
Is the equivalent of the Lifeboat Association in the UK and RS in Norway.